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DISCUSSION => Engine + Driveline => Topic started by: IlovM42 on October 19, 2012, 02:32:44 AM

Title: 323/325 exhaust line on 318is E30 doable?
Post by: IlovM42 on October 19, 2012, 02:32:44 AM

Hi everyones.

Let me tell you my idea.

I have a 318is E30, and i'm putting full Mtech2 bodykit on it. But the original rear silencer look just ridiculous with the Mtech2 rear bumper :(
Biggest problem, i'm in France, and here, the don't like modifying the car with non homologated stuff... and homologated one cost a lot...

So, basically, i was thinking of going the "original bmw route" by this I mean, use original parts from other BMW, E30 if possible.

So after thinking of fitting only the rear silencer from a 323i or 325i with a Y shape pipe, i tought "why don't fit the whole exhaust?" So swapping from single tube to twin tube exhaust from a 323i/325i.

Did someone ever do it on a 318is? i was thinking of keeping the original header (obviously, M20 one won't fit :p) and as all know the M42 header is 4:2:1, so basically i want to adapt the 323i/325i exhaust to the M42 header were there is normally the 2 pipes that go into 1.

Don't know if i'm understandable, i'll show some pics to make it clearer ;)

If you have more info on that :D

Title: 323/325 exhaust line on 318is E30 doable?
Post by: Asterian on October 26, 2012, 06:37:28 AM

I have twin-pipe 4-2 exhaust, but unfortunately this system came with engine, so I never tried original one, so cannt compare.

Title: 323/325 exhaust line on 318is E30 doable?
Post by: Geoff on October 27, 2012, 09:28:05 AM

I suppose that you could do that, but it is,only, imho of course, a useless excercise.  The most efficient exhaust design for a 4 banger is 4to 2 to 1,  so you are using valuable resources of time and money on a project with no advantage or even  a possible disadvantage over the present design.   Having said that,  if you are determined, have at it.    What I would do is cut the outlet of the stock system, and weld a resonated 2 pipe outlet on there.     presto-  instant cool looking exhaust:D
                                                                 Geoff

Title: 323/325 exhaust line on 318is E30 doable?
Post by: IlovM42 on November 14, 2012, 02:31:35 AM

well thanks for the answers, but basically if i had this idea is because it have been done... on the M3 E30 :D but well for the moment i can't find a 323i exhaust line (smaller tube than the 325)
will update if i find it ;)

Title: 323/325 exhaust line on 318is E30 doable?
Post by: romkasponka on November 14, 2012, 05:59:40 AM

Just make a custom exhaust. In USA you have big choice of various manufacturers like: http://www.magnaflow.com.

Title: 323/325 exhaust line on 318is E30 doable?
Post by: IlovM42 on November 14, 2012, 06:32:22 AM

yeah but unfortunately i'am not in the USA, and one of the reason that lead me to do this kind of exhaust job is because I want to have an OEM rear silencer with two exit (like M3 e30, 323 ans 325 ones) cuz here in france police don't really like non homologated parts on car...