King Motorsports Unlimited, Inc. - Mugen Performance Products for Honda and Acura

Vintage Catalogs - King Motorsports Unlimited

We recently came across an OG customer who had all three catalogs that King created in the late 80s / early 90s. Each of these hand-assembled catalogs was called a Volume and included a carefully curated collection of Mugen parts, King parts, information about Mugen, and information about King's racecars and services. Each include thoughtful introductory letters written by King's CEO Scott and are a terrific snapshot of Honda/Acura performance culture at the time.

Because we don't spend much time looking in the rear view, we actually didn't have these Volumes anymore in our own library of literature. In fact we only printed about 1000 of each Volume. So Bill Yoon generously loaned the Volumes to us (including the price list inserts) for us to scan and make available to share with our friends!

Click an item below to download the PDF scan.

King Motorsports Unlimited Catalog Volume 1

KMS Volume 1.pdf (4.43 mb), Circa 1989

KMS Volume 1 Price List.pdf (1.11 mb)

King Motorsports Unlimited Catalog Volume 2

KMS Volume 2.pdf (5.24 mb), Circa 1991

KMS Volume 2 Price List.pdf (909.23 kb)

King Motorsports Unlimited Catalog Volume 3

KMS Volume 3.pdf (3.79 mb), Circa 1993

KMS Volume 3 Price List.pdf (2.24 mb)

Mugen Official Company Profile Sheet Circa Early 1980s

Right-click to see this sheet at full size!


The text:


Hirotoshi Honda
Son of Dr. Soichiro Honda well known. Industrial designer and racing car builder.

Chief design & mechanic:
Masao Kimura
Formerly with Honda racing service center Co., Ltd. Builder of over 15 different racing cars & racing motorcycles. Winner of a total of over 50 races.

Capital stock ¥ 80,000,000
Established March 1973
Land area 6,600m²
Plant space 2,700m²
No. employee 80

We specialize primarily in the design, manufacture, testing and sales of motor sports parts and special racing machine (motorcycle and automobile, both 2cycle and 4cycle) for the Honda manufactured products, and participation in the various races with our products.

Mugen products manufactured by highly skilled personnel with the most up-to-date equipment and developed from extensive research, long experience and rigid testing under many years of gruelling races are used widely by both professionals and general enthusiasts throughout the world.

In the Shop: EK Civic Race Car (Updated)

In the shop recently we are preparing an EK Civic SCCA STL race car. First up- TIG welding door bars:

Next- AIM MXL data aq unit mounted in a very cool carbon fiber inlay:

Dashboard mock up. Check out the KMS custom fabricated adjustable steering shaft....

Just a few more bars and this EK Civic STL roll cage will be complete. Next step is all the tin work to separate the fuel cell from the drivers compartment.

Just a few more bars and this EK Civic STL roll cage will be complete. Next step is all the tin work to separate the fuel cell from the drivers compartment.



Finishing up work bulkhead work on the SCCA STL Civic race car. All aluminum panels are hand fit and then bead rolled for strength. The center section is attached with self ejecting DZUS fasteners for easier access to the fuel cell, fuel pump etc. All other panels are pop riveted in place.

The SCCA STL Civic heads to the body shop today for paint. Back in a few weeks for final assembly! Big thanks to Kyle Gessler of Gessler's Auto for the outstanding service!

Call us today for custom roll cages, race prep and fabrication!

Mugen Civic Si N1 Class Racer Parts Catalog

Here are all the parts you need to build your own Civic Si N1 racer! This awesome brochure is circa 1985.

Right-click any image to see the full-size version.

Bonus pic: The Mugen Civic Si demo car circa 1986. Mugen Sports exhaust, CF48 wheels, Sports Suspension kit and a set of Yokohama A001R tires. This was and very potent autocrosser and a blast to drive on the street!

Honda Tuning Quote: Birth of the King

We just love the way Brian McGurk described King Motorsports in his Honda Tuning feature on our Prelude Race Car -- we just had to repost it here:

Birth of the King

Body kits, engine swaps, JDM trends, stance, and other assorted fads may come and go, but one company was alive and kicking well before most of it ever entered the picture: King Motorsports. Started in 1981 as the race team of a local Honda dealer, the team piloted their 1200cc '74 Civic to their first victory in 1984. Current CEO Scott Zellner started with the team around that time and recalls, "We ran every race we could with our little Civic, at the same time we started designing parts for them too." Throughout the '80s, the team stacked wins while garnering attention from Honda of Japan. "We got to work hand in hand with Honda Special Projects. They did all the cool stuff; it was a very exciting time." Toward the end of the '80s, King received exclusive rights as the sole Mugen distributor in the U.S., a feat not bestowed on just anyone. After that, gears changed rather quickly. "It was weird; we went from a race team to a parts distributor." Even today King Motorsports is synonymous with Mugen on U.S. shores and Scott, still at the helm, see's no end in sight. "We've been racing and winning for 35 years and we're still here and relevant. I'm very proud of it."

No two ways about it, they're the Kings and that's not changing anytime soon.

Read more:

In the Shop: J35 Engine Project

Our next engine development project is brought to you by the letter J!

J35 teardown continues-underneath all that "stuff" there is actually an engine! Complete build pictures and info will be posted as the build progresses. We would like to thank out friends YAWSPORT for this exciting build opportunity!

Update: 10/11/2013:

Cylinder head port work begins our J series engine development program for our friends at YAWSPORT.

J Series cylinder head porting completed for our friends YAWSPORT. Up next, reworking the bottom end.

2001 J.A.S. ETCC Accord Drive Line Assembly

Below is an archival photo of the 2001 J.A.S. ETCC Accord drive line assembly. Destroked H22 with a Xtrac sequential 5 speed. The cylinder heads were rotated 180 degrees so the intake was to the front of the car so the engine could be rotated back. This allowed the engine centerline to be lower in the chassis and improving the handling. These cars were incredibly engineered, rivaling F1 cars of the era.

Image credit (top photo): Still Photography

In the Shop: K-Tuned Shifter, Drag Cartel 003.2 Cams, Turbo B18C1...

More pics from around the shop!


K-Tuned Shifter- Incredible precision and beautifully crafted!


Just installed Drag Cartel 003.2 cams with our King Motorsports 40 degree VTC cam gear and Toda tensioner in this 12.0/1 K20A road race engine. Next up, some tuning on the dyno!

Update: On dyno this week with Ian G's K20A powered DC2. 12/1 compression with Drag Cartel Industries 003.2 cams with our 40 degree VTC cam gear, Hytech header and DC5R intake manifold.

Watch the video from Ian's dyno tuning!

Ian G's K20A powered DC2 race car results 242 whp with a super nice power band and flat torque curve- impressive!

Build Stats:
K20A with 12.1 compression
Drag Cartel 003.2 cams
King Motorsports 40 degree VTC cam gear
Hy-Tech Header
DC5R Intake manifold and throttle body



Intercooler pipe fabrication for our latest turbo project in the shop.

Update: Intercooler pipe fabrication complete, just about ready to head onto the dyno....

Initial engine break in on the dyno begins today for this Turbo B18C1. Once completely heat cycled 2 times we will begin final tuning.

Interview: Chris Mitchell's 1993 Civic Si (EG) - Out of the Blue, Into the Gray

"My race car is greener than your Prius." That's the vinyl message you'd stare at if you happen to be stopped behind Chris Mitchell's purpose-built and daily-driven EG Civic Si. At least that's what you would have seen in 2012, when the car was still a bright blue color, courtesy of the previous owner. Chris just accepted the color, focusing his energy on correcting the mods he inherited. Then he moved on to making his own performance-oriented upgrades. Chris' EG is a home-grown example of function-before-form, and he knows his build is making its own statement in an increasingly noisy modified scene.

Here's Chris' EG at a local Cars & Coffee event in 2012:

Why are Moogs such bullies? :)

I caught up with Chris recently to talk shop.

Q: Tell us about your Civic.

A: I first bought my EG back in 2007 when I was looking for something reliable, fun, and good on gas. At that time I had just sold my 240SX, got out of drifting and was trying to focus on school at Oregon State University. It wasn’t ideal or what I was really looking for, but it was going to keep me out of drifting and met the criteria I set for a new car.

When I picked up the car it wasn’t in bad shape from the outside, minus the color -- and the previous owner decided that a stanced look was what he wanted… I did not haha.

As I mentioned before, what lead me to buying the car was that I needed something that fit my criteria. It didn’t hurt that Honda Civics are super cheap on insurance if you have a clean driving record, which I’m proud to say I still do.

Q: You said the EG had quite a few mods on it already that needed "correction" -- What did you do for a clean slate?

A: The color, the engine wiring, ride height and the “STANCED OUT YO!” look all had to go. It was at a ride height that was not functional for driving long distances, so the first changes were new tires, camber kit and a raised ride height. The engine wiring was janky as hell and had to be re-done in a number of areas. This was my first introduction to what import car life was like.

The car was blue, yes. It was probably the worst paint job I've ever seen, but originally it was buffed and didn't look too bad. After you get a little more involved with a new (to you) car, you start peeling back the onion layers seeing what the car really is. What sucked about it was that the original OEM green color looked great underneath, no blemishes. Original owner FAIL.

So from the photo you can see how Smurf'd out the car was... due to an unfortunate accident involving a young driver not paying attention while doing a u-turn at 2am, the car got re-painted "Graus-schwartz". This happens to be a favorite color for me off the 2010 Porsche 911 GT3 RS. I chose it because 1) it's easy to maintain, but 2) it's just a nice, crisp color. You can't over-do it too much because after's just a Honda Civic! haha

Q: Tell us about your build philosophy and goals.

A: My build philosophy is really, “to each their own”. In the Honda community you’ve probably seen or heard every type of modification you can think of, which is fine; every owner sees or wants something different.

When building this car I took a lot of inspiration from Keiichi Tsuchiya, the Drift King and professional driver in Japan. His personal AE86 has to be the most 50/50, neutrally balanced car I could think of over the years, and I thought, "Why not build an EG to mimic that?" I think I’ll always try to build a neutral balanced car that corners as hard as it accelerates and brakes as well as it corners.

Q: Have you had the car dyno'd? What were the numbers?

A: I have had the car dyno’d and with its current configuration, it is sitting just shy of 160whp on a Dynocom Dynomometer.

Q: Future plans for the EG?

A: The future is uncertain for this car. I am in the process of acquiring a new car/ project, so this may turn into a track day/ weekend warrior permanently. If that does happen, there’s no doubt it’ll be compound charged and peak out around the 500whp range. Of course it’ll still have to grip as well as it accelerates so my aerodynamic toys will have to be developed.

Q: Mods you would recommend for other EG owners?

A: I say whatever makes you smile at the end of the day. If you want to have a catalog car and never drive it, so be it. If you love the track and want a ridiculous looking, but fast beast car, do it. The EG itself is a great chassis to build upon and done right, can hang with the best of them. I think suspension, brakes, and tires are the most important components if you’re dealing with a mild build, but want it to be competitive or fun. Everything else just gets out of hand and more complex as you go.

Q: Mods you would tell others to avoid?

A: Avoid spherical bearings for the street, haha. They say don’t do it; Don’t, unless you can afford replacing them frequently. I think another suggestion is that if you build an N/A D16Z6 or any D-series, be careful and do your homework before you get in too deep. It’s a costly engine to build past 120whp or so. It’s a lot of fun being unique and to turn heads, but there’s a lot of other more cost-effective options.

Q: What cars were in your past?

A: My first car was a 1996 Volvo 850 (I know, Grandma-car status) which I first tinkered with aero and suspension components. It felt like an aircraft carrier, but handled surprisingly well.

I also had a Nissan 240SX (S13) which I drifted for a bit before the engine let go. That was before I knew much about engine building. I’d like to build another S14 with a supercharger setup sometime down the road.

Q: What is your experience with autocross, track, etc? How does the EG handle?

A: I’ve been doing autocross for about five years now, going to different events in Southern Oregon. I’ve also participated in Time Attack and a few road rallies, placing first in class several times. Recently I’ve been crew chief for a local ChumpCar team and next season I’ll be racing in Vintage and NASA series.

The EG handles like it’s on rails. As long as you don’t over-do-it and leave the front end a little softer, it will not understeer and rotates like a RWD car; Honda knew what they were doing when they engineered that suspension system. I hear a lot of people who don’t exactly understand driving dynamics argue that a FWD car can never handle as well as a RWD or AWD, but I assure you, when done right, it’s sublime in the corners.

Q: Do you have a dream car?

A: Do I have a dream car.... hmmm. That's a tough one. I guess if money was no object, I'd love to own either a Ferrari F40 or a Koeneggsigg Agera R due to both cars being basically insane to drive. There might be other cars out there, but I enjoy a car that throws a curve ball at you from time to time. Maybe a little on the dangerous side? I'm a bit of an idiot in that department from what my friends have said. I'd love to drive a Ferrari 599 GTO simply because it's a handful, and the Ferrari test drivers mentioned it was impossible in the wet.....that's my kind of car. Whatever I build I don't want it to be another car you've seen before, there has to be a little extra magic, a dose of danger, and of course provide a thrill for the driver.

Q: I know you're active in the car community -- What roles/groups are you involved in? 

A: I’ve been very fortunate to know a lot of people within the racing and car culture in the Pacific Northwest. Being asked to help out a group or organization is something I love doing and I’ll try to keep doing it as long as I can.
– Creative Director, Staff Photographer, Writer
NASA – Driver, Photographer
Porsche Club of America – Photographer
Audi Club Northwest – Photographer – Photographer
Northern Echelon – Staff Photographer
Sidedraught City – Driver, Online Manager, Writer, Photographer
Cascade Sports Car Club – Driver, Member
SCCA – Driver, Member
Red Door Meet – Designer, Staff Photographer, Member

Chris Mitchell's 1993 Honda Civic Si (EG):

Eagle H-beam rods
Supertech High comp pistons 12:5:1
Supertech rings
ACL Race bearings
ARP Head studs
Bored out 75.5mm
P&P, 3 angle valve job, de-shroud, combustion chamber re-shape
Crower Ti springs, retainers, Honda valves
Bisimoto Level 3 Cam
Bisimoto cam gear
Buddy Club Spec II exhaust
Bisimoto V2 header
Custom TB velocity stack - intake
K&N filter
Walbro 255 fuel pump
Edelbrock inline fuel filter
Earls -6AN fuel lines/ fittings
B&M fuel gauge
Chipped P28 ECU running CHROME GOLD
NGK wires/ 7E plugs
Megan Racing radiator
Custom Radiator fan w/ shroud
ES motor mount inserts
Blackworks catch can system - AN fittings

2010 Porsche GT3 RS "Graus-schwarz" paint
Seibon carbon fiber hood
Rear Duckbill style spoiler
Porsche HID projector retrofit
Aerocatch flush hood pins
Mono-Blade wiper system
Front bumper canards
lower air dam
lower splitter

ACT Xtreme sprung 6 puck clutch
ACT Xtreme pressure plate
Bisimoto 9lb flywheel
Wilwood 1" MC - Brake booster delete
S2000 CMC w/ custom lines
B&M spherical short shifter kit
Synchrotech Gearbox

Buddy Club N+ Spec coilovers
Skunk2 Pro-Series camber kit
Blox RLCA's - ES poly bushings
Front/ Rear tower brace - C-pillar brace
ASR rear subframe brace - 24mm rear swaybar
Honda 19mm front swaybar - ES poly bushings - ES poly endlinks
Aurora endlinks
Blackworks rear camber arms
Blox Extended balljoints
ES poly trailing arm bushings
BEAKS lower tie bar
Buddy Club upper mounts
Megan Racing 4 point chassis brace

Brembo Blanks (all 4)
Hawk HP+ pads (all 4)
Goodridge stainless steel lines
Toyo Proxes4 205/50/15 (ST), Toyo R1R 225/50/15 (TR)

Sparco Monza steering wheel
NRG 2.0 quick-release
Custom 6" knurled shift knob
Custom carbon fiber switch plate


** Visit the King Motorsports online store for performance and aero parts for your EG Civic. **