straight pipe, big rasp at 2k rpm

z19930612 · 07-16-2014, 09:04 PM

The car sounds like a JDM VTEC between 2000-2500 rpm...
Mod:
cp-e ic
cp-e charge pipe
cp-e catless downpipe
DCI
Tial bov
M3 backbox
2ndary cat delete
JB4 map 1 in video

The car doesn't make any exhaust noise apart from 2000-2500 rpm range, and it was a very loud rasp, but after that, it's all induction noise only

Just feel annoying when I blip the throttle at downshift in everyday driving for a MT...it just doesn't sounds right for me for a bimmer...does anybody know what should I do to the exhaust or the backbox to make it sounds bit normal like this...

Thanks...

Tiago@VRSF · 07-16-2014, 09:37 PM

Sounds like you need a couple resonators where the cats used to run.

alguuu · 07-17-2014, 12:38 AM

Went through the same ordeal. Two Vibrant 1792s will fix the low end rasp. There's still a bit of rasp at the high end though.

11SEC · 07-17-2014, 08:50 AM

Vibrant resonators will fix this. If I were you I'd get the ultra-quiet versions and install them where your mufflers used to be. Placing them there will take care of the low end rasp and high end rasp.

07-16-2014, 09:04 PM	#1
z19930612 Lieutenant 129 Rep 483 Posts Drives: 1 Series M Coupe Join Date: Feb 2013 Location: Shanghai iTrader: (0)	straight pipe, big rasp at 2k rpm The car sounds like a JDM VTEC between 2000-2500 rpm... Mod: cp-e ic cp-e charge pipe cp-e catless downpipe DCI Tial bov M3 backbox 2ndary cat delete JB4 map 1 in video The car doesn't make any exhaust noise apart from 2000-2500 rpm range, and it was a very loud rasp, but after that, it's all induction noise only Just feel annoying when I blip the throttle at downshift in everyday driving for a MT...it just doesn't sounds right for me for a bimmer...does anybody know what should I do to the exhaust or the backbox to make it sounds bit normal like this... Thanks...
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07-16-2014, 09:37 PM	#2
Tiago@VRSF 2097 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	Sounds like you need a couple resonators where the cats used to run.
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07-17-2014, 12:38 AM	#3
alguuu New Member 0 Rep 9 Posts Drives: 2010 335i Join Date: Jul 2013 Location: Toronto iTrader: (0)	Went through the same ordeal. Two Vibrant 1792s will fix the low end rasp. There's still a bit of rasp at the high end though.
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07-17-2014, 08:50 AM	#4
11SEC Banned 5 Rep 254 Posts Drives: E92 335i Join Date: May 2014 Location: Canada iTrader: (0)	Vibrant resonators will fix this. If I were you I'd get the ultra-quiet versions and install them where your mufflers used to be. Placing them there will take care of the low end rasp and high end rasp.
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