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How a Twin-Clutch Transmission Works

A gearbox for all drivers.

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Blueprinting Aging Fuel Injectors Can Extend Life and Increase Results

The first thing we do whenever we pick up an older car is go through the fuel system.

Featured makes: Toyota
What Makes the Best Air Intake?

We built (and actually tested) different intake designs.

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How to Modify the ND-Chassis Mazda MX-5: Tips From Good-Win Racing

We posed a simple question: What are the three most important modifications to make?

Featured makes: Mazda
From the GRM Vault: Heavy Duty

Miata need more power? Take things to 11.

Featured makes: Mazda
Tech Tips: Porsche Boxster

Can you live with an older Boxster?

Featured makes: Porsche
Veggie Tales

Al Taylor intends to clean up with his soy-fueled racer.

Featured makes: BMW
Slippery Slope

Choose the correct motor oil for your application.

Featured makes: Triumph
Breaking In

Before Taking Your New Race Car on Track, You’d Be Wise to Properly Break It In

Featured makes: Honda
Cut-Rate Rallycrosser — Part 3: Breaking and Braking

We still had some questions as to why the engine came unglued in such a spectacular fashion.

Featured makes: Dodge
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