Project E46 M3, Part 17: Preferred exhaust, MKC/AEM tune


They also modified the compressor housing to accept a vacuum port and used Vibrant clamps, hoses and piping throughout, which we like (they’re our friends, you see). The 3794R turbo has been known to reach power levels exceeding 900 WHP.

Since the turbo sits so low, it drains to this oil scavenge pan. The oil gets pumped out from here and back into the oil pan.

MKC lowered the lowest point on the subframe with this hunk of metal to take all of the abuse when scraping over speed bumps and stuff, or in the case of hitting something that may have fallen on the highway.

Here’s a look at the Treadstone intercooler.

MKC built brackets for the intercooler to secure it to the front of the car.


  1. Dear All
    Just read your exhaust articles on the E46 M3. I’d like to replicate what you did with the VAC / Fabspeed headers, standard cat section then Corsa cat back. I’ve looked on VAC’s website but they only appear to sell Active Autowerke Performance headers ( Can you comment on this please? Do you think I’ll get the same / similar results that you did. I would like the slight improvement in power, no drone, decent quality and fitment, etc. My car is mainly road going with some track days.
    Thanks in advance for any help.
    Kind regards, John

    1. hi John, the droning issue will be taken car of at the mid-section and back/muffler end of the exhaust, especially the back. As long as the AA headers are similar fitment (legnth-wise) with the previous Fabspeed/VAC units, you should be fine, and I would assume make similar power, too. But that’s a question for VAC. Personally I’ve never had any problems with AA products, and I ran a lot of it in my earlier “E36” days. All of their exhaust stuff fit well, too. And if you still decide to go with Fabspeed, may just have to get them direct, is all, if VAC doesn’t carry it anymore. Thanks for reading, and best of luck!

  2. Thanks very much for the response. I have emailed Fabspeed as it looks like they only do left hand drive fitment but mine’s a right hand drive. Will see where this goes. Appreciate your help.
    Regards, John

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