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FAQ: Performance Exhausts and Exhaust Systems

What is the difference between a cat back exhaust system and an axle back exhaust system?

The difference between a cat back exhaust and axle back exhaust is the length of the exhaust system. An axle back exhaust begins at the last attachment point and ends at the exhaust tips. Cat back exhausts start at the catalytic converter and end at the exhaust tips. Cat back exhaust systems include a middle pipe and rear section (axle-back). If you want a sportier sound and nicer look, you'll likely be happy with an axle back exhaust system. If you're looking for performance gains along with better sound and looks, you'll want a cat-back exhaust upgrade.

What are the benefits of upgrading my exhaust?

Most people upgrade their exhausts for the performance gains - specifically a bump in horsepower and torque. Some customers report seeing fuel economy gains as well! With a new exhaust, you'll also enjoy an enhanced engine note both inside and outside the cabin.

Will installing a new performance exhaust impact my manufacturer's warranty?

No. A dealer cannot void your warranty for installing a cat back exhaust or axle back exhaust system.

Are the exhausts STILLEN® sells CARB exempt?

Yes, each cat back exhaust or rear exhaust STILLEN® sells is CARB exempt.

Why should I purchase an aftermarket exhaust from STILLEN®?

STILLEN® only sells exhaust systems made by reputable auto part manufacturers that stand behind their products. Currently, we carry exhausts made by STILLEN®, JBA, Gibson, Magnaflow, Injen and COBB. For your peace of mind, each stainless steel exhaust we carry comes with a limited lifetime warranty.We offer standard shipping on most exhaust systems, so you won't incur any oversize shipping fees on most orders. And if only the very best will do, we manufacture our own STILLEN® brand exhaust systems right here in our Southern California facility.

Contact Us

If you have any questions, give us a call at (866) 250-5542 and we will be happy to answer any questions you have about exhausts.