1998 E36 323i + M3 exhaust system

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  1. 1998 E36 323i + M3 exhaust system 
    #1
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    Mark_F's Car Details
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    I've acquired a full M3 exhaust system via QM - Great service / price from these guys by the way.

    Before I go about fitting it, has anyone done this and what problems have you encountered. I'm totally comfortable with what has to be done, but did you have to replace anything when hanging the center section? Does the backbox hang OK on the OE non-M brackets?

    I'll be replacing the o2 sensors, exhaust manifold nuts and gaskets etc as I go.

    Any info?
     
     

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    xXxStKxXx's Car Details
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    Back box hangs fine on the brackets you have-I have the M3 back box on mine.AFAIK the rest just bolts on like a standard exhaust.Did you get the EVO manifolds cause I believe these have the same lambda sensor points as the 323-or is that the 328?
     
     

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    Mark_F (27-04-2011)

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    hamish262001's Car Details
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    as above if it's the full evo system incl manifolds it should be a handy swap as the lamdas will be the same
     
     

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    Mark_F (27-04-2011)

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    Mark_F's Car Details
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    Yeah, I specifically went for the Evo manifolds due to the lambda positions. Handy to know. I'll be fitting it in the next few weeks. I'll be interested to know the weight difference between the two, the middle section on the M3 system is very heavy, I'll do a weight comparison when I take the old system off.
     
     

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    xXxStKxXx's Car Details
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    Yeah the M3 back box is very heavy compared to the 325 one.....
     
     

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    M3 TIM's Car Details
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    Quote Originally Posted by StK View Post
    Yeah the M3 back box is very heavy compared to the 325 one.....
    yep very heavy i held mine up then my bluflame aftermarket box and the weight differance was loads.i also i used to have an e36 325i and i did a box swap and again the standard items weigh a lot more.
     
     

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    powerofm's Car Details
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    This mod is worth a few BHP and throttle response from what i have read on previous conversions.

    What you might want to do to the original box is cut it open, take out all the snake pipes, (these are used to cancel out noise) and weld in 2 straight pipes from one end to the other exit pipe end and then get some steel wool, pack it in there for a bit of noise reduction and weld back up, you'll have a slightly louder and lighter back box. Just make sure the pipes you weld in are exactly the same diameter as the pipes coming from the engine side.

    Some people just gut the entire exhaust and weld back up but this is very loud and sounds like you left a spanner in the box!!

    This is how the aftermarket exhausts are designed, like supersprint. Its the straight pipe with a box round the back packed with the desired amount of steel wool.



    http://www.europeancarweb.com/tech/e.../photo_09.html

    hth
    Last edited by powerofm; 10-05-2011 at 21:06.
     
     

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