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  1. #1
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    M3 exhaust and cold air intake

    I am interested in changing out my current stock M3 exhaust and adding a cold air intake to my 2003 M3 coupe. I would be very interested in any comments, experiences (positive and negative) and product recommendations. I am new to this site and to the San Diego area. Does anyone know of a good BMW mechanic / tuner?


  2. #2
    Hugo
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    About the exhaust

    I don't have an M3, but an 318iS. But the idea is generally the same: create less backpressure. What I did is the ultimate budget exhaust. I bought a free-flow universal cat, and two cherry-bomb dampers from JC Whitney. I then fabricated the pipes from PVC (home-depot) and had the pipes replicated by an exhaust-dude in steel pipes. Complete freeflow exhaust incl cat done for US$250,- Nice, eh?

    The ECU of the M3 should cope with the reduced backpressure and it should give the odd extra HP. But don't expect miracles, I just did it because I bought the car without exhaust!

    Don't know about the cold air intake, didn't get round to that, yet.

    Regards,

    Hugo

  3. #3
    TTek
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    You would expect that but....

    The E46 M3 has cats as part of the headers. Until you change to either the euro set up or supersprint you will not free up much back pressure.

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    Re: M3 exhaust and cold air intake


  5. #5
    Hugo
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    True, but I


  6. #6
    Hugo
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    Oops, wrong key: about the US or euro cat.

    I was thinking euro set-up, because I'm Dutch. But with a universal cat, I think one should be able to get thru the emmisions test.

    Hugo

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