exhaust options

[static]

what does straight though mean?

straight-T H R O U G H mufflers, means no baffles or anything else on the way of the gas flow. Magnaflow, Vibrant and Borla are straight-through

[Mr.SWISS]

OK guys. I lied. My exhaust is LOUD and when I go under an underpass and gun it, the sound reverberates as if I were driving a V6 Mustang with glasspacks. I like the sound, so I find myself gunning it every time I go under an underpass.

I finally drove my swap car a fairly long distance, and at idle the car is pretty quiet. But if you open it up, it is positively guttural. Not good for a DD, but plenty fine for impressing the ladies.







Um OK so I lied again. The ladies don't dig the E30.

Oh yeah, 5th gear acceleration FTW.

I just had them connect my stock 325i exhaust system to the m50 down pipes, cat and all. I don't like how they did my O2 bung though.

[BDSax]

what does straight though mean?

[dougsic]

just whatever you do, don't go straight through. No matter how big mufflers you put on it, it's still loud and droney

Agree!

[static]

just whatever you do, don't go straight through. No matter how big mufflers you put on it, it's still loud and droney

Best bet is to probably modify and retain the stock configuration with stock cats/resonators, and maybe some nice catback like stromung.

Something like this is best

http://www.mallcrawlin.com/forum/showthread.php?t=6453

[BDSax]

bumping this up because its exhasut time.

im using ebay headers. they fit ok but i think im going to have to add a couple spacers to lift up the header. its like 1mm away from the subframe, unless i dent the header.

I read the thread and im liking the X pipe, and e36 m3 muffler. on the ebay headers they came with clamp connectors and one side is 2" and the other is 1.75", do i need an adaptor to attach it to the X Pipe?


anyone have any input for my needs? i dont want it to loud although anything will be better then it is now.

[matt]

My exhaust system is Ebay headers, a VSR center section, and a Stromung cat-back. I am hoping to adapt the header collectors to the mating plate at the front of the VSR pipe. It's all just "off the rack" E30M3 parts.

What about O2 sensor location? I'm not really worried about installing it in such a manner as to allow sampling of all 6 cylinders. Rather I need to learn more about its proximity to the cylinder head and the effect of EGT on the sensor and accuracy. Is this even a concern at all? Should I just weld a bung on the a collector and call it a day?

kr

Not really a concern. Anywhere after the stock OBDII location back to the stock OBDI location is fine.

[kroberts]

My exhaust system is Ebay headers, a VSR center section, and a Stromung cat-back. I am hoping to adapt the header collectors to the mating plate at the front of the VSR pipe. It's all just "off the rack" E30M3 parts.

What about O2 sensor location? I'm not really worried about installing it in such a manner as to allow sampling of all 6 cylinders. Rather I need to learn more about its proximity to the cylinder head and the effect of EGT on the sensor and accuracy. Is this even a concern at all? Should I just weld a bung on the a collector and call it a day?

kr

[bmwpower]

most likely an e36 mid pipe, and hyou can get away with those parts for under 200 bucks if you souced out thos parts youself if you did the research.

So this sounds like a better option than piecing together some universal stuff from Autozone or what have you.

[tonytony]

most likely an e36 mid pipe, and hyou can get away with those parts for under 200 bucks if you souced out thos parts youself if you did the research.

[bmwpower]

the only spot that is modified, i image, are the downpipes right before the cats.

So, then what they're giving you is what in the picture? An E36 or E30 midpipe?

[rede30]

the only spot that is modified, i image, are the downpipes right before the cats.

[bmwpower]

Does anyone know what Zionsville offers? They have a package deal for exhaust:

http://www.zionsvilleautosport.com/store/shop.mv?Screen=PROD&Store_Code=6134&Product_Code=EES&Category_Code=CKE

And say if you want it "modified to fit" it's another $400. What/how are they modifying?

[static]

^^ hmm, i like my s50 performance, but hate the noise

so i recently put one of those magnaflow metallic core spun cats and unfortunatelly the diff in noise is almost unnoticable
basically, i have an option of swapping my round 22x4" res for a 18x4x9 muffler but i am unconvinced it will make it quiet either (will probably quiet it down a little but not worth the $200 for muffler and labour). My res is flanged, so maybe i can experiment with some baffled types to cut down on noise substantially and if i don't like it - swap it out.
The main annoying note is higher pitched buzzing/whine (like a chainsaw) i wish there would be a resonator designed to eliminate these kinds of frequencies.

here is a video: http://video.google.ca/videoplay?doc...09603&hl=en-CA
(but you cannot really hear the high pitched noises for some reason)

[dougsic]

My loud exhaust has been quieted by a chambered resonator and an "Xelerator" chambered muffler. Nice and quiet but the performance loss is stunning.

Another thing about a louder exhaust - it sure makes matching revs when down shifting a lot easier and more fun to do.

Last night I ran against a very clean e36 M3 on the interstate. We were dead even. I want my performance back.