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Mitsubishi Evo X (CZ4A) Exhaust FAQ's

Please read our FAQs page to find out more.

What exhaust diameter is best for a stock-frame turbo Evo X?

A 3.0-inch turboback supports strong flow and response. Larger piping suits big turbos; add a resonator to control drone for daily use.

Should I choose a catted or catless downpipe on the Evo X?

High-flow cats support power while reducing smell and rasp. Catless flows more but may not be emissions legal—check local laws and always retune.

Do I need a tune after installing a downpipe on the Evo X?

Yes. Post-turbo changes alter boost control and fueling. A calibration restores proper AFR and protects the engine under load.