well, when i was changing my oil at a friends shop up on the lift the other night, i noticed that on my 92 325i, in the bottom of my acs muffler there are some rust holes, and my cats seemed to be stopped up....being that we have no smog laws in alabama would it hurt to have my exhaust guy run new dual pipes from the manifold all the way back to a new muffler? If i can't get a dual in dual out muffler for a decent price will it hurt to go from two pipes to one into the muffler and then two out of the muffler? thanks for any help!!
thinking of having custom exhaust done
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SpeedsterBMW
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you might loose a little torque with no cats actually...
Buy my Race Exhaust! Here are the specs:
downpipes back
gutted cats with tubes welded inside (stealth to cops)
3" stainless steel press bent piping after cats to
straight thru Bullet Performance polished muffler
Used for 400 miles, taken off for smog. Name your price
*edit: and it surely doesn't sound like rice (I have a 1992 325i also!)
downpipes back
gutted cats with tubes welded inside (stealth to cops)
3" stainless steel press bent piping after cats to
straight thru Bullet Performance polished muffler
Used for 400 miles, taken off for smog. Name your price
*edit: and it surely doesn't sound like rice (I have a 1992 325i also!)
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2,326 Posts
If you get a custom exhaust:
1) Make sure it uses mandrel bends
2) Talk to the guy about getting a stepped system (the pipes would go wide in diameter the farther out from the headers they go. Stepped exhaust are of the most efficient design)
3) If you have no cat laws then have them removed, it would be one less thing to worry about. The torque loss can be made up with other mods for low end power.
4) If you can get new headers, or get them fabricated for you, then see if you can get the headers in a stepped design also. The pipes should get larger in diameter as the get to the collector (i.e. - 2 1/4 inch diameter should step to 2 1/5 at the collector).
Good luck
1) Make sure it uses mandrel bends
2) Talk to the guy about getting a stepped system (the pipes would go wide in diameter the farther out from the headers they go. Stepped exhaust are of the most efficient design)
3) If you have no cat laws then have them removed, it would be one less thing to worry about. The torque loss can be made up with other mods for low end power.
4) If you can get new headers, or get them fabricated for you, then see if you can get the headers in a stepped design also. The pipes should get larger in diameter as the get to the collector (i.e. - 2 1/4 inch diameter should step to 2 1/5 at the collector).
Good luck
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I like the Eismann quad tip for the E36 . contact me if more info is needed. :driving
AAA Performance Exhaust
www.aaaexhaust.com
we ship cross country...we got the latest trend'z...and we do quality custom work..check us out..
[email protected]
www.aaaexhaust.com
we ship cross country...we got the latest trend'z...and we do quality custom work..check us out..
[email protected]
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692 Posts
i'm not sure that i would go straight pipes all the way, but its your ride. if you don't have enough back pressure it can actually cause a greater lose of power than sometimes having too much.
i was considering running dual straight pipes before, but i'm not gonna risk the lose of power. your custom exhaust guy can probably tell you what to expect from it, but most often straight pipes are done on larger vehicles such as v8's (what you said he most frequently works on).
I found a few sites with really good deals on catalytic converters and o2 sensors.
oh thats another thing, you may get error with your o2 from straight pipping. if you don't use them you will get errors for sure, and if you do then the exhaust may be too rich when it meets the o2 sensors and you'll get errors that way.
if you want those sites that i bought my stuff from i'd be glad to help, just im me.
cheers and goodluck with the maintenance.
i was considering running dual straight pipes before, but i'm not gonna risk the lose of power. your custom exhaust guy can probably tell you what to expect from it, but most often straight pipes are done on larger vehicles such as v8's (what you said he most frequently works on).
I found a few sites with really good deals on catalytic converters and o2 sensors.
oh thats another thing, you may get error with your o2 from straight pipping. if you don't use them you will get errors for sure, and if you do then the exhaust may be too rich when it meets the o2 sensors and you'll get errors that way.
if you want those sites that i bought my stuff from i'd be glad to help, just im me.
cheers and goodluck with the maintenance.
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692 Posts
haha, you're right! didn't even notice that, haha. looks like "mode310" is spamming with advertisments for his company or something, haha. i think these post should be removed from this thread as they are not contributing to the original question or author. post 11 and down should be deleted.
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