Custom made exhaust

AKG · 07-19-2011, 10:35 PM

Did my own stainless steel exhaust but it is too loud, added 2 vibrant resonators but not much difference.
Any ideas on how I might quiet it down not giving up gained whp?
I have cp-e catless downpipes and left the oem mufflers, deleted second cats.
Thanks for any suggestions.

tofu- · 07-19-2011, 10:53 PM

could have used longer resonators i guess.

an X or H pipe to equalize should make it sound less raw too

i don't see how that setup could be too loud with OEM mufflers and resonators though. maybe your expectations are unrealistic?

wren57 · 07-19-2011, 11:05 PM

That is too loud? Wow. Seems like it'd be quiet. Check and see if the golf tee/trunk actuator mod has been done. If so, undo it.

MKR_DmD · 07-19-2011, 11:10 PM

You can put some cherry bomb muffler in line with the pipe.

AKG · 07-20-2011, 12:31 AM

Quote:

Originally Posted by tofu-

could have used longer resonators i guess.

an X or H pipe to equalize should make it sound less raw too

i don't see how that setup could be too loud with OEM mufflers and resonators though. maybe your expectations are unrealistic?

I never thought it was going to be loud but it is, and specially at low rpms when it shifts I don't like the sound, it sounds like a Honda!!! (sad to say)
you really think an x pipe will do a better sound?
it doesn't have the golf tee mod.
Thanks

iflo · 07-20-2011, 01:40 AM

Post a video. We need to see how loud this setup is. It just doesn't seem like it would be too loud.

enrita · 07-20-2011, 02:00 AM

x-pipe or some 100 cell cats.

danniexi · 07-20-2011, 08:16 AM

i have a very similar set up... UR catless downpipes, secondary cats deleted and OEM mufflers. the only difference is that I DO have an x-pipe (but no resonators). I personally don't think it's loud at all. with the windows up there is a bit of resonance, but i do feel the exhaust can be louder. i think its a very good compromise.

try adding the xpipe. should help i think.

ETS Michael · 07-20-2011, 09:58 AM

We tried it this way prior to making our X-pipe. It's way loud.. Once you add the x-pipe in it makes the note a lot quieter. At least it did for our exhaust system.

Michael

CobraMarty · 07-20-2011, 01:15 PM

What diameters are those pipes? ID and OD.

AKG · 07-20-2011, 02:23 PM

Quote:

Originally Posted by CobraMarty

What diameters are those pipes? ID and OD.

They are 2.5" OD, I dont know the ID but they are thin pipes...

AKG · 07-20-2011, 02:26 PM

Quote:

Originally Posted by ETS Michael

We tried it this way prior to making our X-pipe. It's way loud.. Once you add the x-pipe in it makes the note a lot quieter. At least it did for our exhaust system.

Michael

Thanks for the advise, would you put the X pipe in front or behind the resonators or does it make any difference?

And what is the real purpose of the X pipe, less? or better sound?

07-19-2011, 10:35 PM	#1
AKG Enlisted Member 9 Rep 31 Posts Drives: BMW 335i Sedan Join Date: Jul 2011 Location: Guatemala iTrader: (0)	Custom made exhaust - too loud!!! Did my own stainless steel exhaust but it is too loud, added 2 vibrant resonators but not much difference. Any ideas on how I might quiet it down not giving up gained whp? I have cp-e catless downpipes and left the oem mufflers, deleted second cats. Thanks for any suggestions. Attached Images
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07-19-2011, 10:53 PM	#2
tofu- Banned 87 Rep 2,854 Posts Drives: 335i Jet Black/Coral Red Join Date: Mar 2010 Location: nyc iTrader: (4)	could have used longer resonators i guess. an X or H pipe to equalize should make it sound less raw too i don't see how that setup could be too loud with OEM mufflers and resonators though. maybe your expectations are unrealistic?
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07-19-2011, 11:05 PM	#3
wren57 Roll Tide 591 Rep 2,345 Posts Drives: 335i Join Date: Jul 2010 Location: St Louis iTrader: (10)	That is too loud? Wow. Seems like it'd be quiet. Check and see if the golf tee/trunk actuator mod has been done. If so, undo it. __________________ Fix your broken/stripped cowl bolts with this elegant brass solution! http://www.e90post.com/forums/showthread.php?p=20230306
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07-19-2011, 11:10 PM	#4
MKR_DmD Lieutenant 6 Rep 494 Posts Drives: 16 Jeep Cherokee Join Date: May 2010 Location: Germany iTrader: (3)	You can put some cherry bomb muffler in line with the pipe.
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07-20-2011, 01:40 AM	#6
iflo Second Lieutenant 21 Rep 203 Posts Drives: BMW 335i Coupe Join Date: Mar 2010 Location: Louisville iTrader: (1)	Post a video. We need to see how loud this setup is. It just doesn't seem like it would be too loud.
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07-20-2011, 02:00 AM	#7
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	x-pipe or some 100 cell cats. __________________ 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
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07-20-2011, 08:16 AM	#8
danniexi Brigadier General 3053 Rep 4,388 Posts Drives: 2022 F97 X3M Comp LCI Join Date: May 2008 Location: NJ/NY iTrader: (15) Garage List 2022 BMW X3M Compet ... [10.00] 2016 BMW F80 M3 [10.00]	i have a very similar set up... UR catless downpipes, secondary cats deleted and OEM mufflers. the only difference is that I DO have an x-pipe (but no resonators). I personally don't think it's loud at all. with the windows up there is a bit of resonance, but i do feel the exhaust can be louder. i think its a very good compromise. try adding the xpipe. should help i think. __________________ BMW MY22 F97 X3MC LCI - CURRENT BUILD THREAD\| Instagram: @danniexi BMW MY16 F80 M3 - GONE BMW MY08 E92 335XI - GONE BMW MY06 E46 325XI - GONE
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07-20-2011, 09:58 AM	#9
ETS Michael Major 76 Rep 1,155 Posts Drives: 335i Join Date: May 2009 Location: Vancouver, WA iTrader: (4)	We tried it this way prior to making our X-pipe. It's way loud.. Once you add the x-pipe in it makes the note a lot quieter. At least it did for our exhaust system. Michael
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07-20-2011, 01:15 PM	#10
CobraMarty Major 619 Rep 1,402 Posts Drives: 2007 328xi e90 + e92 Join Date: Sep 2010 Location: BimmerMILVs.com iTrader: (7)	What diameters are those pipes? ID and OD.
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