Catless Race Downpipes

These downpipes are listed in a catless (straight-through or free-flow) version. Several are sold as catless or catted, so choose the version on the product page. They replace the factory downpipe and its catalytic converter with...

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About Catless Race Downpipes

These downpipes are listed in a catless (straight-through or free-flow) version. Several are sold as catless or catted, so choose the version on the product page. They replace the factory downpipe and its catalytic converter with a straight stainless pipe for less exhaust restriction.

Fitments include BMW B58, B46/B48, S55, S58, S63, N55 and N63 engines, Audi S4/S5, RS3/TT RS, RS4/RS5 and RS6/RS7, Mercedes-AMG C43, E53, G63, GT and GT63, Porsche 718, 911 and Macan, plus Ferrari, Lamborghini and McLaren. Brands are STRATEC Systems, Spool Performance, Palenon Performance and IRL. Catless and high-flow downpipes are intended for off-road / competition use and may not be legal for road use in your area.

See all exhaust and downpipes.

Frequently asked questions

What is a catless downpipe?

A catless (race) downpipe removes the catalytic converter from the first section of exhaust behind the turbo. It flows the most of any downpipe type and lowers the backpressure the turbo pushes against, which is why it suits track and competition builds. Expect more sound, rasp and exhaust smell than a catted pipe.

Are catless downpipes legal on the street?

Catless and high-flow downpipes and other emissions-related parts are intended for off-road and competition use and may not be legal on the street where you live. A high-flow converter is not the same as a certified replacement part, so check your local laws and inspection rules before you buy or install one.

Do I need a tune for a catless downpipe?

Plan on one. Without a converter the rear oxygen sensor reads differently and a check-engine light may occur. Many listings recommend a supporting tune, and the brands quote their gains with proper tuning. Talk to your tuner before you order so the software and hardware match.

Will a catless downpipe smell or drone?

Cold starts and idling smell noticeably stronger without a converter, and the tone gains rasp. Drone, the steady boom at highway cruise, is shaped more by the mid-pipe, resonators, mufflers and valves than by the downpipe alone, but a louder downpipe gives the rest of the system more to deal with.

Do the downpipes reuse the factory oxygen sensors and hardware?

Most downpipes reuse the factory oxygen sensors, so have an O2 sensor socket ready; seized sensors are common on older exhausts. Some pipes add sensor bungs, extensions or heat shields that change how the sensors fit, so check the listing for your part, and inspect the factory clamps and gaskets while everything is apart.