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How to choose the right oil for your engine

Sure, the manual tells you what oil you need–but what if you've moved beyond stock?

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Basic body work part 4: Wet sanding, buffing and polishing

Yes, a decent paint job can look good on its own, but a bit of work (and polish and wet sanding) can really make it shine.

How to fabricate a custom exhaust header

Be it a limited aftermarket or just a desire to do it yourself, here is how you build an exhaust header from scratch.

Can Retrofitting Newer Injectors Really Provide a Quick, Inexpensive Power Bump?

Looking for an easy, low-buck power gain? Newer fuel injectors may be a quick fix.

Easy ND Mazda MX-5 Performance Tips from Good-Win Racing

What are the three most important modifications to make on an ND MX-5? Good-Win Racing’s Brian Goodwin gave us two separate lists, one for street and autocross, and another for …

Honda
What's the Diff? | Figuring Out Which Differential Setup Is Fastest on Track

Three differential approaches, three different answers.

How to pick the right gear ratio for your needs

There are lots of ways to adjust gearing.

Low-Buck Tech Tips From the Clever Readers of Grassroots Motorsports

Our readers are an endless source of clever solutions to automotive problems great and small. Their low-buck fixes and fabrications would make MacGyver proud.

Do Performance Brake Pads Really Matter at Autocross Speeds?

Do higher-performance brake pads really make a difference around an autocross course? We tested four flavors of brake pad on our Mazda MX-5 project car to find out.

Suspension bushings: Small yet important pieces of your suspension system

Pushing your car to the limit? Have you thought about your bushings lately?

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