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Message: <blockquote data-quote="Tom" data-source="post: 38279" data-attributes="member: 1"><p>i've tried various ways.. my favourite that i have now is,6(3-1, 3-1) branch extractors -> 2X2"- 1X2.5" -> borla centre -> 1X2.5" -> borla mufflerthere's some lag though... there could be a link between the single pipe conversion now + the unichip map + extractors, power comes in at 4K with a little surge <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Borla exhaust from the E46 323i, they are pretty loud and raspypipes are all galvanised steel... stainless would be ideal <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> (next project, stainless extractors - downpipes to mufflers, yummy)p/s: i have to say this though, the stock E30 325i centre muffler is a bulletproof great sounding muffler, even without a rear muffler, the 325i sounds REALLY good. i've tried.but please, never ever run without a center muffler. it sounds like SHIT.cheers!Tom</p></blockquote><p></p>