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Overview

Mk4-R Challenge Car

Competition Only

The Mk4-R Challenge car is the competition version of our best selling Mk4 Roadster. The car takes the Mk4 Roadster to a more serious competition level and is engineered to be used in wheel-to-wheel road racing, drag racing, and is eligible for NASA’s Factory Five Challenge Series.

LEARN MORE

"Brawny good looks, high quality materials, outta-my-way exhaust note, abundant thrust. A primal brute that will confirm all your mother-in-law's worst suspicions."
LARRY WEBSTER | EDITOR, CAR & DRIVER MAGAZINE

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Kit Packages

Get Ready to Build Your Mk4-R Challenge Car!

Kit starts at $21,990

If you are a person who plans to use your car for more than an occasional open-track day, then this chassis kit was designed for you. Built from the foundation of the proven Mk4-R chassis, the modified Challenge Car chassis meets SCCA GT1 design criteria and is approved for NASA’s wheel-to-wheel Factory Five Racing Challenge Series and other race classes.

LEARN MORE >    ORDER A KIT >

Design

Race-Proven Strength,
Balance, and Safety.

If you are a person who plans to use your car for more than an occasional open-track day, then this chassis kit was designed for you. Built from the foundation of the proven Mk4 chassis, the modified Challenge Car chassis meets SCCA GT1 design criteria and is approved for NASA’s wheel-to-wheel Factory Five Racing Challenge Series and other race classes.

Challenge Car Frame

A great car starts with a great chassis. A chassis is the foundation of the house. Today’s fourth-generation Mk4 Roadster frame has benefited from years of refinement and development. It is both lightweight (376 lbs.) and strong.

"This ain't no kit car." – Mustang & Fords Magazine

The Challenge car chassis is built on the strong foundation of our world class Mk4 frame. Connected to that beautiful tube steel frame is an array of aluminum panels bonded and riveted in place like any good race car should be. Aluminum panels make-up the car’s sub-frame and liners.

Period-Correct Shape, Made Correct. Period.

The Factory Five Challenge model comes with the same hand-laid vinylester composite body as the Mk4. The doors are single panel (unlike the double-lined and hinged doors of the Mk4), and have pre-drilled mounting holes and positioned hood. Lamination thickness is 3/16” all around with .015” coat of gloss red gel coat.

Challenge Car
Suspension & Brakes

The strong Challenge chassis is complemented by an outstanding and proven suspension and the ability to use a wide array of excellent brake packages. Suspension design and engineering is an extremely challenging endeavor. Over the years we’ve found what works best in the real world of racing. You can’t get lucky and you can’t say it works unless you prove it. The only way to prove it is at a track and under the most extreme circumstances over many, many years.

Challenge Car
Running Gear

In the early days most challenge car were built with spec Mustang running gear (engines/trans/rears). Nowadays with the proliferation of not only spec legal series cars, but monster open track customs, we can only tell you what fits (with respect to engines etc)… we can’t tell you what to use!

Climb into the Past.
Rocket into the Future.

The interior of the Challenge car is all about the business at hand. No carpeting or street seats here. You get all the functional interior pieces and trim that comes with the roadster, except for items that are not needed by racers.

Challenge Car Exterior

While it’s true that most folks will only see you as you blur past them from 50 feet at more than 50 mph, a good number of people will look at your car up close in the pits. Just because this is a dedicated race car doesn’t mean the small trim doesn’t matter.

Our Safety Record
Is No Accident

The legends of the '60s were built not only from racing victories, but from tragedies as well. Back then, many basic safety features were either not used or not available. Today’s Factory Fives are stronger, faster, and safer than the original cars.

Support

FAQs, BUILD VIDEOS & MORE

The process of evaluating whether or not this project is right for you is an important one and there are several places you can go to get accurate, truthful, and current answers to your questions.

Read our FAQ’s page to get answers to a few questions we get every day here at Factory Five, or delve into our Build Videos where you can follow along as the Factory Five tech guys give step-by-step instructions on building a Factory Five Mk4 Roadster.

You can call us here at Factory Five at 508-291-3443 and speak to one of our guys in tech support. You can also log onto the Internet and query thousands of Factory Five owners about their own builds and discover an entire community of helpful customers on The Factory Five Forum.

FAQs >   |   BUILD VIDEOS >   |   FACTORY FIVE FORUM >

Galleries

VIEW MORE GALLERIES

Press

"...When it comes to bang-for-the-buck, Factory Five Racing's Mk4 is the Molotov cocktail of replicas..."

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 Steve Temple, Editor Car Builder Magazine
Former Director of Marketing, Shelby American

"Brawny good looks, high quality materials, outta-my-way exhaust note, abundant thrust. A primal brute that will confirm all your mother-in-law's worst suspicions."

logo-car-and-driver-small Larry Webster, Editor
Car & Driver Magazine

"This car really works well in the turns. It has to be one of the best handling cars I've ever driven."

sccalogoDick Smith, six-time SCCA & USRRC Champion
and all-time winningest 427 Racer.

"...We like Factory Five not only for the level of enjoyment a person can have with it strapped to his backside, but for the great engineering and business feat it is..."

mustang-fords-logoJim Smart, Editor
Mustang & Fords Magazine