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-   -   E36 325iS Exhaust (http://www.maxbimmer.com/forums/showthread.php?t=24970)

325iSBimmer 11-28-2003 03:02 AM

E36 325iS Exhaust
 
Im not sure how to start explaining this; so here goes nothing...

On my 94 325iS; and every other 325 and 328 since 92-98;
the exhasut comes from the two split manifold and down into twin 2" intermediat pipe. The pipe then goes from the twin 2" setup and gets funneled into a signle 2" pipe for about 12" to where there is a single oxygen sensor and the it splits back off into it's previous 2x2" design and then continues into the twin cats and of to the dual in dual out muffler.*th-up*

Now.....i work at an exhaust shop and i know a thing or two about flow and they way exhaust systems function. I'm thinking that if there wasn't that section that squeezes the two pipes into one you would have better flow and therefore gain somewhat in the horsepower department. I have done before and can make up a section that would replace the single setup with twin pipes with a section contecting the two in order to equalize backpressure and utilize the single oxygen sensor. Also known as an "H" pipe.

The only thing thats stoping me from doing this is that fact that BMW does know how to build a car and why would they put this single section in what would be a "true" dual exhaust set-up. There must be a reason for it; whether it be to use only one Oxygen sensor.....to equalize backpressures between the first 3 and last 3 cylinders.....or in order to compress the exhaust gases into a smaller pipe therefore making the concentration higher and allowing the Oxygen sensor to get a clear and proper reading.

The first two things don't cocern me that much cause the "H" pipe design still does those two things.....BUT the last on is what could mean the difference between the car runing better or worse than before....:confused:

SOO....what I'd like to know is; has anybody had something like this done with their exhasut system and if so how did it turn out.

I'm not overly concerned because the worst thing that could happend is the car won't run as well as before and I can just weld the original piece back into place:rolleyes:*th-up*

325iSBimmer 11-30-2003 09:42 PM

BUMP!

mkgino 11-30-2003 09:43 PM

Waste of time. The effort put in, wont be worth the gain in HP, if there is any for that matter.

325iSBimmer 11-30-2003 09:53 PM

you make a good point MKGINO....
But how come people will spend $$$ on a supersprint or whatever else, system when the exhaust is being choked up way in the beggining....
are those systems pretty much just for sound?

BTW.....i love the way ur front end looks.....is that a M3 front bumper w/ rieger or just regular 328 bumper w/ rieger.

and are those hella headlights w/angle eyes

mkgino 11-30-2003 10:08 PM

Quote:

Originally posted by 325iSBimmer
you make a good point MKGINO....
But how come people will spend $$$ on a supersprint or whatever else, system when the exhaust is being choked up way in the beggining....
are those systems pretty much just for sound?

BTW.....i love the way ur front end looks.....is that a M3 front bumper w/ rieger or just regular 328 bumper w/ rieger.

and are those hella headlights w/angle eyes

I got my exhaust for the sound. A lot of people know that the performance increase is minimal with an exhaust. When you mess around with bolt ons, you shouldnt expect much from them.

If this does work, you are looking at like 3hp tops, 5 if your lucky?? Not worth it. And if it did work, there would be companies that have a kit, so they can make money off of it (kinda like the fan delete kit which is useless IMO).

Thanks for the complements!! The front end is an original M3 front end with original rieger lip I ordered from the states.

The elliosoids are ZKW, with LLAE angel eyes.

I think that if you are not willing to spend the extra cash for the M3 front end, rieger makes a lip for the stock 3-series front, that I think looks amazing!

BMW_7 11-30-2003 10:43 PM

hmm. so if the exhaust is just for appearance and not performance, why not just get a tip?

Furious 11-30-2003 10:51 PM

sound.


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