Audi A4 Parts

Finished installing the Bosal premium CAT and ended up getting the replacement downpipe from Bosal too. Had to cut the original out cause it would NOT come through the engine bay. I had my car on Jack stands instead of a lift. So, after I cut out the old CAT, installing the new Bosal premium CAT was so much easier. Even accessing the oxygen sensors was a piece of cake. It has a lot deeper rumble and much less restriction than the factory one. May upgrade to the Bosal exhaust system soon and see if it gives any more performance. Honestly, very pleased with this Catalytic converter, and the Bosal company. Only gripe I have is the sticker on both of them. It would be nice if the sticker was vinyl, not paper. But it can be taken off carefully with goof off and a razor, then clean up with citrus degreaser. If you install this CAT, make sure to get the Bosch O2 sensors too. They created the first O2 sensors and they’re superior quality. No more check engine light! Good luck!