Straight pipes + race cats

turb0mik3 · 07-19-2010, 02:22 AM

Hey everyone,

I am getting my ER competition intercooler installed at the moment and have some saved up extra $$$$. I would like to get AR design catless downpipes to really free up the system. Currently, I am running stock DPs, resonator, still have my secondary cats, and have a muffler delete. I absolutely love the sound. So my question to all of you is...

What will be the best way to free up the exhaust system but not have the car be ridiculously obnoxious (there is a difference between loud and obnoxious)? My idea is to get the catless downpipes, then add a set of race-cats towards the end of the exhaust piping (Maybe add a resonator if necessary).

Is anyone running this catless DP + set of race cats w/ no mufflers setup?

Thanks so much!!!

jacky822 · 07-19-2010, 03:45 AM

try just the header itself lol.. just jk

enrita · 07-19-2010, 03:49 AM

Catless dowpipes for sure than Hi-Flow secondary cats. You wont need resonators if you have a set of cats in place.

07-19-2010, 02:22 AM	#1
turb0mik3 242 Rep 2,781 Posts Drives: E90 335i Racecar Join Date: Jan 2010 Location: San Diego, CA iTrader: (1) Garage List 2010 BMW 335i [8.90]	Straight pipes + race cats Hey everyone, I am getting my ER competition intercooler installed at the moment and have some saved up extra $$$$. I would like to get AR design catless downpipes to really free up the system. Currently, I am running stock DPs, resonator, still have my secondary cats, and have a muffler delete. I absolutely love the sound. So my question to all of you is... What will be the best way to free up the exhaust system but not have the car be ridiculously obnoxious (there is a difference between loud and obnoxious)? My idea is to get the catless downpipes, then add a set of race-cats towards the end of the exhaust piping (Maybe add a resonator if necessary). Is anyone running this catless DP + set of race cats w/ no mufflers setup? Thanks so much!!! __________________ HG Motorsports \| Motiv Motorsport \| Sparta Evolution \| BBS Motorsports \| Sabelt \| JRZ \| NASA ST1 SoCal --- 554whp/487wtrq --- 3200lbs <<YouTube Channel w/ Race Videos>>
	Appreciate 0 Tweet Quote

07-19-2010, 03:45 AM	#2
jacky822 First Lieutenant 48 Rep 393 Posts Drives: E60 M5 Join Date: Dec 2009 Location: Seattle, WA iTrader: (2)	try just the header itself lol.. just jk
	Appreciate 0 Quote

07-19-2010, 03:49 AM	#3
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Catless dowpipes for sure than Hi-Flow secondary cats. You wont need resonators if you have a set of cats in place. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
	Appreciate 0 Quote