DIY-Make your 330i sound a little better

markis64 · 12-26-2006, 09:24 PM

All the mod does it keep the valve open for noise restriction, it should have any effect on hp gains or losses. The sound is not noticeable enough for my satisfaction so i returned it back to stock, if the mod could even be called a mod. Maybe it would have a better effect with an intake? or an exhaust? or a 335

rkg · 12-27-2006, 02:05 PM

Flooring from 20 mph will sound the same with or without this mod ... you can really only hear it at idle or below 2K when the valve is closed. The youtube clip is a waste other than the beginning when at idle.

Also, this valve provides no back pressure and thus no hp loss ... it is strictly a noise modification ... this has been bashed to death on the e46 sites.

Chesmu · 12-27-2006, 08:33 PM

does the valve have any real function?

m3power13 · 12-29-2006, 05:20 PM

I am no expert by any means, but I would think this valve serves a purpose. My GSX-R 600 has a similar valve in the exhaust that stays closed at lower RPM's. The purpose of the valve is to create more backpressure at low rpms's which will yeild more power. The valve will later open at higher RPM's when the backpressure is not needed. Just like some here have stated that they have noticed losses in power when doing this mod, those who removed the valve on their motorcycles also noticed a loss in low-end power.

psychoactive · 03-12-2007, 02:55 PM

Back pressure improves low-end response, so I've heard anyway... forcing the valve to remain constantly open would probably cause a loss in low-end response then...

gt3jo · 03-13-2007, 06:10 PM

I had to do the mod when installing quad pipes on my 335. The quad ends where not long enough to fit the valve without having the pipes stand far out from the back of the car.....

Didnt sense any loss of power, but the sound is far rawer and deeper according to friends who stand by as I fire up and pull away....... but I guess thats what friends are for........

montreal_bimmer · 03-13-2007, 11:14 PM

looking at that video, and noticed that the 330 doesnt reall seem THAT much quicker than the 325....

deffinatly less of a difference than the 335 and the 328

bimdaddy · 03-14-2007, 10:29 AM

Quote:

Originally Posted by psychoactive

Back pressure improves low-end response, so I've heard anyway... forcing the valve to remain constantly open would probably cause a loss in low-end response then...

But isn't less back pressure better on turbo cars? No difference at the seat of the pants, but I can definitely hear a little more exhaust hum/drone while driving compared to before the mod.

330itx · 03-16-2007, 03:16 AM

i just did it & it sounds the same shit & i think i broke my alve thing
Question : is the alve supposed to stay open all the time even if i put the hose back on ? i put the hose back on all the way just like stock & the vale still stays open

bimdaddy · 03-16-2007, 12:45 PM

Quote:

Originally Posted by 330itx

i just did it & it sounds the same shit & i think i broke my alve thing
Question : is the alve supposed to stay open all the time even if i put the hose back on ? i put the hose back on all the way just like stock & the vale still stays open

Not sure about your 330, but you'll definitely hear the difference on the 335. When you turn off engine, the valve remains open. When you start, the valve closes for about a minute, then opens again.

SteveMD · 03-16-2007, 01:43 PM

This is the 'Golf Tee Mod'. It has nothing to do with back pressure or performance. It has to do with noise and specifically low frequency reverberation at low revs. Something that non-enthusiasts may frown upon being a luxury car etc.

The valve is closed at low RPMs to keep noise in the cabin down. At higher RPMs (not sure when and can't be bothered to find all the other threads that have discussed this) it opens up the second zorst.

It does not slow the car down.
Removal of pipe does not throw any codes.

Removal of the pipe will keep the flap open since the failsafe mode is open.

IMO, the car sounds louder on idle and low revs.

E92_335 · 07-30-2007, 12:04 AM

wow i just did this.. sounds effing AMAZING

i hav a 335 coupe and wow does it make a difference! at lower RPMs it sounds absolutely beautiful!! im very excited and thank you to whoever came up with this mod!

ejazbmw · 07-30-2007, 01:59 PM

Quote:

Originally Posted by montreal_bimmer

looking at that video, and noticed that the 330 doesnt reall seem THAT much quicker than the 325....

deffinatly less of a difference than the 335 and the 328

haha you probably pissed off about half of the 330 owners

...but i did notice a difference between the 330 and 325 not much but there is a difference

calvino · 07-31-2007, 12:56 AM

Quote:

Originally Posted by ejazbmw

haha you probably pissed off about half of the 330 owners

...but i did notice a difference between the 330 and 325 not much but there is a difference

this + intake = sex

check this other video
:rocks:

Canyonblaster · 08-04-2007, 08:13 PM

Cool! I just did it. I love it. The car sounds really good now at all rpm's and road speeds. I am soooo stoked to find out about this. Thanks. I have to say, after owne alot of turbo cars, the BMW engineers did a friggin great job to get this car to sound so good. Most turbo cars sound like #ss! - quiet or loud. This car sounds awesome. I wonder if anyone has taken out the middle resonators....hmm..

I had a VW R32 and did the same thing. That car sounded like a baby ferrari. Really good. My recent Audi S4 V8 I put an actual AWE catback on it. It sounded like an Aston Martin. I do miss that sound but not the car all that much (vs the 335xi!!).

I guess I was a dip sh#t to not look for this but actually never would'a thunk it!?

I am a big "sound" fan. My 911 sounds great with pretty cool mod that alot of the guys do called secondary bypass pipe. It is an actual exhaust pipe that goes in place of a secondary muffler. About a $200 part. Pretty low $ in Porsche speak. She sounds pretty good.

E90330iS · 08-04-2007, 08:21 PM

Ya did this mod long time ago, kind of make me wonder why 330i and 335i had it but not 325i and 328i. If it is purely for sound, I don't think 330i is that much louder than 325i.

al4m · 08-18-2007, 01:15 PM

so this mod cant be done with a 328?
i wanna try out this mod, but really dunno if i should
i'm getting a lot of mixed emotions from the guys who've done it
hmmm

calvino · 08-18-2007, 02:20 PM

it can't be done in the 328 or 325 your muffler don't have the valve, sorry

Hoothout · 05-20-2008, 01:39 PM

are there any side effects of doing this it seems like, something wrong could happen but thats just me

nic330i · 04-02-2009, 12:13 AM

mine is a 06 330i, can i do this trick?~
beacause i cant locate the muffle valve...=.=

nic330i · 04-02-2009, 12:27 AM

i guess i found it... but i didnt do anything...the valve is opened!!?!?!?!?!
howcome...i didnt notice any different... i turned off my car... the valve is still opened...

is my car already modded?!

LiverpoolSuarez7 · 06-18-2009, 10:31 PM

i have an e93 and the hose wont come off the valve, how much force is it supposed to take to remove it!

12-26-2006, 09:24 PM	#23
markis64 Lieutenant 60 Rep 419 Posts Drives: 2006 E90 Alpine White 330xi Join Date: Dec 2006 Location: Long Island NY iTrader: (1) Garage List 3006 e90 330xi [0.00]	All the mod does it keep the valve open for noise restriction, it should have any effect on hp gains or losses. The sound is not noticeable enough for my satisfaction so i returned it back to stock, if the mod could even be called a mod. Maybe it would have a better effect with an intake? or an exhaust? or a 335
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12-27-2006, 02:05 PM	#24
rkg Private 2 Rep 69 Posts Drives: e90 Join Date: Sep 2005 Location: Seattle iTrader: (0)	Flooring from 20 mph will sound the same with or without this mod ... you can really only hear it at idle or below 2K when the valve is closed. The youtube clip is a waste other than the beginning when at idle. Also, this valve provides no back pressure and thus no hp loss ... it is strictly a noise modification ... this has been bashed to death on the e46 sites.
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12-27-2006, 08:33 PM	#25
Chesmu Brigadier General 89 Rep 3,011 Posts Drives: 2013 X6 Join Date: Dec 2005 Location: Phoenix,AZ iTrader: (2) Garage List 2006 330i [0.00] 2006 330i [0.00]	does the valve have any real function? __________________ "Teach the ignorant. Ignore the stupid."
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12-29-2006, 05:20 PM	#26
m3power13 Lieutenant 111 Rep 531 Posts Drives: E92 M3 Stripper Join Date: Nov 2006 Location: Raleigh, NC iTrader: (0)	I am no expert by any means, but I would think this valve serves a purpose. My GSX-R 600 has a similar valve in the exhaust that stays closed at lower RPM's. The purpose of the valve is to create more backpressure at low rpms's which will yeild more power. The valve will later open at higher RPM's when the backpressure is not needed. Just like some here have stated that they have noticed losses in power when doing this mod, those who removed the valve on their motorcycles also noticed a loss in low-end power.
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03-12-2007, 02:55 PM	#27
psychoactive Banned 19 Rep 192 Posts Drives: 2007 328i Coupe Join Date: Mar 2007 Location: San Diego iTrader: (0)	Back pressure improves low-end response, so I've heard anyway... forcing the valve to remain constantly open would probably cause a loss in low-end response then...
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03-13-2007, 06:10 PM	#28
gt3jo Enlisted Member 4 Rep 40 Posts Drives: 335iA E91 AW/Lemon Join Date: Nov 2006 Location: Norway iTrader: (0)	I had to do the mod when installing quad pipes on my 335. The quad ends where not long enough to fit the valve without having the pipes stand far out from the back of the car..... Didnt sense any loss of power, but the sound is far rawer and deeper according to friends who stand by as I fire up and pull away....... but I guess thats what friends are for........ __________________
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03-13-2007, 11:14 PM	#29
montreal_bimmer OEMconcept 174 Rep 5,593 Posts Drives: BMW Join Date: Feb 2006 Location: Canada \| USA iTrader: (6) Garage List 2006 325i [10.00]	looking at that video, and noticed that the 330 doesnt reall seem THAT much quicker than the 325.... deffinatly less of a difference than the 335 and the 328
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03-16-2007, 03:16 AM	#31
330itx Registered 0 Rep 2 Posts Drives: 06-330 i Join Date: Jun 2006 Location: Houston Tx iTrader: (0)	i just did it & it sounds the same shit & i think i broke my alve thing Question : is the alve supposed to stay open all the time even if i put the hose back on ? i put the hose back on all the way just like stock & the vale still stays open
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03-16-2007, 01:43 PM	#33
SteveMD Colonel 196 Rep 2,485 Posts Drives: 2016 F10 535i MSport Join Date: Dec 2005 Location: Raventown! iTrader: (3)	This is the 'Golf Tee Mod'. It has nothing to do with back pressure or performance. It has to do with noise and specifically low frequency reverberation at low revs. Something that non-enthusiasts may frown upon being a luxury car etc. The valve is closed at low RPMs to keep noise in the cabin down. At higher RPMs (not sure when and can't be bothered to find all the other threads that have discussed this) it opens up the second zorst. It does not slow the car down. Removal of pipe does not throw any codes. Removal of the pipe will keep the flap open since the failsafe mode is open. IMO, the car sounds louder on idle and low revs. __________________ 2006 E90 330i (retired) 2009 E90 335i (retired) 2012 E70 X5 50i M Sport (retired) 2016 F10 535i M Sport
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07-30-2007, 12:04 AM	#34
E92_335 Colonel 156 Rep 2,863 Posts Drives: G20 330i Join Date: Jun 2007 Location: CA iTrader: (7)	wow i just did this.. sounds effing AMAZING i hav a 335 coupe and wow does it make a difference! at lower RPMs it sounds absolutely beautiful!! im very excited and thank you to whoever came up with this mod! __________________
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08-04-2007, 08:13 PM	#37
Canyonblaster Private 5 Rep 55 Posts Drives: 2015 X1 28i Xdrive Msport Join Date: Jul 2007 Location: Denver & Vail, CO iTrader: (1)	Cool! I just did it. I love it. The car sounds really good now at all rpm's and road speeds. I am soooo stoked to find out about this. Thanks. I have to say, after owne alot of turbo cars, the BMW engineers did a friggin great job to get this car to sound so good. Most turbo cars sound like #ss! - quiet or loud. This car sounds awesome. I wonder if anyone has taken out the middle resonators....hmm.. I had a VW R32 and did the same thing. That car sounded like a baby ferrari. Really good. My recent Audi S4 V8 I put an actual AWE catback on it. It sounded like an Aston Martin. I do miss that sound but not the car all that much (vs the 335xi!!). I guess I was a dip sh#t to not look for this but actually never would'a thunk it!? I am a big "sound" fan. My 911 sounds great with pretty cool mod that alot of the guys do called secondary bypass pipe. It is an actual exhaust pipe that goes in place of a secondary muffler. About a $200 part. Pretty low $ in Porsche speak. She sounds pretty good.
	Appreciate 0 Quote

08-04-2007, 08:21 PM	#38
E90330iS Major General 143 Rep 6,333 Posts Drives: BMW M4 Join Date: Jan 2006 Location: Arcadia, California iTrader: (56) Garage List 2006 330i [0.00]	Ya did this mod long time ago, kind of make me wonder why 330i and 335i had it but not 325i and 328i. If it is purely for sound, I don't think 330i is that much louder than 325i. __________________ 2017 BMW M4 DCT Lease Transfer: https://f80.bimmerpost.com/forums/sh...8#post23736398
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08-18-2007, 01:15 PM	#39
al4m Major General 149 Rep 7,390 Posts Drives: e90 328i - sgm Join Date: May 2007 Location: SF iTrader: (6) Garage List 2007 328i [0.00]	so this mod cant be done with a 328? i wanna try out this mod, but really dunno if i should i'm getting a lot of mixed emotions from the guys who've done it hmmm __________________
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08-18-2007, 02:20 PM	#40
calvino Lieutenant Colonel 306 Rep 1,928 Posts Drives: had e90, 330i mystic blue Join Date: May 2006 Location: Weston,Florida iTrader: (4) Garage List 2006 e90 330i [0.00]	it can't be done in the 328 or 325 your muffler don't have the valve, sorry __________________ E90 Mytic Blue 330i 07-20-2006. 05-17-2011 Doesn't the idea of making nature against the law seem to you a bit . . . unnatural? Support NORML
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05-20-2008, 01:39 PM	#41
Hoothout Colonel 59 Rep 2,799 Posts Drives: 2008 BMW E92 328i Join Date: May 2008 Location: Brentwood, TN iTrader: (0) Garage List 2008 e92 328i [0.00]	are there any side effects of doing this it seems like, something wrong could happen but thats just me __________________ 2008 SG E92 328i iDrive,Premium Pkg,Sport Pkg,Cold Weather pkg,Black Dakota Leather,GP Thunder 8500k cornering,drl,and foglights, ,Blacked Out Grills,Painted Reflectors,Shadowline Emblems,Hardwired Beltronics V-995, AFE Intake, Muffler Delete, Berger tune
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04-02-2009, 12:13 AM	#42
nic330i Enlisted Member 1 Rep 43 Posts Drives: Navy 330i Join Date: Jun 2008 Location: Burnaby, Vancouver iTrader: (0)	mine is a 06 330i, can i do this trick?~ beacause i cant locate the muffle valve...=.=
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04-02-2009, 12:27 AM	#43
nic330i Enlisted Member 1 Rep 43 Posts Drives: Navy 330i Join Date: Jun 2008 Location: Burnaby, Vancouver iTrader: (0)	i guess i found it... but i didnt do anything...the valve is opened!!?!?!?!?! howcome...i didnt notice any different... i turned off my car... the valve is still opened... is my car already modded?!
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06-18-2009, 10:31 PM	#44
LiverpoolSuarez7 Enlisted Member 10 Rep 44 Posts Drives: 2008 bmw 335i Join Date: Jun 2009 Location: US iTrader: (1)	i have an e93 and the hose wont come off the valve, how much force is it supposed to take to remove it!
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