Exhaust - BMW Forum

MACK_328is · 03-28-2005, 11:42 AM

Guys,
Was wondering what everyone's thoughts were on removing the hose to the exhaust flap on the right tip of the muffler? I tried this and didn't notice any big sound difference/HP really. I also noticed that in 3rd gear (auto) that when I lifted off the gas and the rpm's wanted to stay around 3200 for a few seconds. I got spooked and didn't want to blow $hit up so I re-attached it back on to the pipe. I'm sure BMW made it like that for a reason so I'm leaving it alone until I get my exhaust mod. Did anyone else try this yet?

Mack

"Accelerate till you see GOD......then brake"

///M Power · 03-28-2005, 02:13 PM

It's there for a reason. To help with low end torque and opens up in the higher range. Leaving it on would be ideal.

MACK_328is · 03-28-2005, 09:35 PM

Quote:

Originally posted by ///M Power@Mar 28 2005, 04:13 PM
It's there for a reason. To help with low end torque and opens up in the higher range. Leaving it on would be ideal.

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MACK_328is · 03-28-2005, 09:36 PM

Quote:

Originally posted by MACK_328is+Mar 28 2005, 11:35 PM--><div class='quotetop'>QUOTE(MACK_328is @ Mar 28 2005, 11:35 PM)</div><div class='quotemain'><!--QuoteBegin-///M Power@Mar 28 2005, 04:13 PM
It's there for a reason. To help with low end torque and opens up in the higher range. Leaving it on would be ideal.

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Thats why I put it back on. I see alot of guys in here doing it and figured I'd see what it did. Didnt do Shit! LOL

Later,
Mack

///M Power · 03-29-2005, 04:35 AM

Conformity is for fuckheads.

fredo328 · 03-29-2005, 06:11 AM

I did it. Actually I did it, put it back on then took it off again. I wasn't sure how much louder it got so as the car was running I took off, listened then put it back on and it is definitely louder. Granted its just a sound thing, it doesnt do anything harmful and as for low-end torque I've not noticed any difference-or course Im not racing off of stop lights these days either. That butterfly flap doesn't open up until you hit 3000 rpms, which for me is around 85mph,when you have the tube attached. Because of this I thought that maybe my MPG might be affected but on a recent 500 mile roadtrip averaging 75 mph (not going over 3000 rpms) I got 32 MPG, so I figured I would just leave it off. Most of the guys that I've asked about this say it is there to keep the noise down, similar to the baffle that we all eventually take out. As for Conformity, heh yeah right.