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Message: <blockquote data-quote="aoch88" data-source="post: 539129" data-attributes="member: 8491">Thanks to turbology and stig for the information. To be honest, this sounds very complex and I am utterly confused, haha. My instinct is telling me to just leave it alone (untouched) <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> I think I might as well get a proper quad exhaust done instead of removing any of these cat-con. Btw just to share, the other day I went to Super Circuit in Sunway and as usual their prices are extremely over-priced (costs even more compared to JFA). They claim that changing rear muffler does not increase power and recommended me to change from extractor all the way to the end. I wasn't very convinced obviously but recently I bought a Hypertune magazine and there's a E92 335i which had it's exhaust done in Super Circuit. In the mod, no cat-con was removed and they basically changed only the piping and made it a quad exhaust setup. After a few rounds of dyno, the increase is only 5bhp, lol.I think for the price we're paying to Super Circuit especially a car like 335i with only a 5bhp increase, it's just not worth it IMHO <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>

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