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How to Accurately Measure Your Compression Ratio

What is your engine’s compression ratio?

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How to Go About Upgrading Your Brakes

“Jack of all trades, master of none” is a pretty good description of OE brake system designs.

Catalytic Converter Face-Off

Are catalytic converters just a cork in the system?

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From the GRM Vault: A Grassroots Guide to Braking Systems

A plain-talk primer on your car's braking system.

Salvage Yard Supercharging: Adding 50 Percent More Power for About 200 Bucks

How to make your own DIY supercharger setup.

Featured makes: Mazda
Bracket Art

Quickly and easily make your own professional-looking hardware.

What Materials Are Best to Fabricate Something From Scratch?

For true gearheads, a car is never just a car—it’s a four-wheeled heap of possibilities.

Freeing Rusty Fasteners With a Blow Torch

There is another option to break rusty fasteners free: the hot wrench.

From the GRM Vault: DIY Head Porting

Increasing cylinder head airflow without the aid—or cost—of a flowbench.

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