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Oil , Shop Work , GRM+ , Engine Oil
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?

Paint | Body Work | GRM+ | Polishing
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.

Per Schroeder
Fabrication | headers | Metalwork
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.

Andy Hollis
fuel | tech | Injector | Retrofit
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.

Alan Cesar
Mazda | Miata | MX-5 | Good-Win | ND
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 …

Staff Writer
Per Schroeder
transmission | Gearing
How to pick the right gear ratio for your needs

There are lots of ways to adjust gearing.

Staff Writer
Low-Buck Tech
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.

Staff Writer
Mazda | Miata | Autocross | brake pads
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.

Per Schroeder
suspension | Handling | Bushings
Suspension bushings: Small yet important pieces of your suspension system

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

David S. Wallens
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