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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > help: just removed my second catts with straight pipes and sounds terible!



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      10-25-2012, 06:45 AM   #1
x800pro6
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help: just removed my second catts with straight pipes and sounds terible!

hi guies, i just removed my second catts and sounds so bad, like really rattle tinny vibration sound, comming out of the back of the car (extreamly loud), i have, rr cattless downpipes, the rattle sound starts from 1.8k rpm till about 2.1k rmp when the car is under slight load. it sounds terrible!!!(it sounds like the muffler baffles are vibrating). i have jacked the car up and had a look, however i dont see anything rubbing on the exaust. the sound is so bad literally sounds like a honda civic with hole in exaust. the only time it sounds better is when i use DS mode as the car keeps the revs above 2k normally. i have tried golf tee mod and without. sounds a bit worse with the golf tee mod. please any help would be greatly appreciated! thank you!
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      10-25-2012, 06:46 AM   #2
x800pro6
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i also got bigger exaust tips welded on at the same time i got the second catts removed. definatly not the sound i was trying to achive from some of the circulating youtube vids.
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      10-25-2012, 06:49 AM   #3
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Quote:
Originally Posted by x800pro6 View Post
i also got bigger exaust tips welded on at the same time i got the second catts removed. definatly not the sound i was trying to achive from some of the circulating youtube vids.
Wow soo happy you psted this up because i was about to do this myselff
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      10-25-2012, 07:23 AM   #4
enrita
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you should have searched/asked before doing that. Especially with AT fully catless without any resonators it sounds like crap....
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      10-25-2012, 07:32 AM   #5
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      10-25-2012, 08:29 AM   #6
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You're brave doing that setup without Vibrant resonators. Resonators will clean up that sound tremendously and you'll be very happy with the end result.
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      10-25-2012, 08:31 AM   #7
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I am fully catless and no resonator.. stock mufflers. No strange sounds.
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      10-25-2012, 08:42 AM   #8
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I am fully catless and no resonator.. stock mufflers. No strange sounds.
Do you have mufflers?
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      10-25-2012, 09:55 AM   #9
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Quote:
Originally Posted by triggz View Post
Do you have mufflers?
Stock mufflers.
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      10-25-2012, 10:06 AM   #10
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You need to weld Vibrant 1792 resonators instead of the cats, otherwise the sound is unbearably raspy. However once you put the resonators in, everything will come back to normal.
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      10-25-2012, 02:41 PM   #11
x800pro6
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thanx guies! the sound it terible sounds like the exaust is touching something. i think im just going to put the catts back in as the car does small a bit. i did notice a peformance imrovement removing the rear catts!! definatly! maby i drill a couple of holes in this one b4 putting it back in hahahah. dam n54 is running at its limit, wish there was a fuel upgrade so i could mount some massive turbos. so i dont have to do stupid things like remove my catts in a desperate move just to make more power. haha
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      10-25-2012, 02:44 PM   #12
x800pro6
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NEXT STEP, electric cutouts that work with pnumatics, and upen after 8psi.
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      12-01-2012, 09:11 PM   #13
x800pro6
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i put the catts back in, car smells like roses again haha. and sounds good. thanx guies
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