We Test the BimmerWorld Exhaust and Epic Tune for S65 V8 M3


Here’s a look at our new BW Racing X-pipe setup mated to our Corsa exhaust, ready for dyno testing. It is a good looking setup, no doubt.

BW has been using tuner Randy Mueller’s Epic Motorsports’ software for years and, if you followed our Project E46 M3 closely, you would have seen us use Randy’s software in two setups, with and without headers. Only after a full afternoon’s custom tune with an AEM Infinity fully progammable EMS, were we able to better the Epic tune by a mere 5 WHP—a testament to Randy’s “off-the-shelf” software tune for that BMW.

The supplied instructions from Epic makes this process very simple. The Epic ECI tool goes into the OBD port (left). Then the software is first read, which takes several minutes. That will give you a movie file, which is then emailed to Epic. When Randy receives it, he tweaks the file to fit your car, and sends it back to you to upload in the same manner you downloaded the first stock file.

After uploading the new Epic flash via its ECI tool, it tells you everything successfully programmed. It even gives you a smiley face to make you feel like you’re a real tuner because you uploaded something to your car.

This is one of BW’s friendly M.O’s, which is sending a pack of imported German Haribo gummy bears.

Back at MKC Performance in Kansas City, we are ready to dyno test. Check out the test results on the next page.


  1. I’m investigating issues where the E92 M3 with Bimmerworld resonated X-Pipe has a torque dip/hesitation/bog under light-moderate acceleration around 2500 RPM. Did you encounter this with your vehicle either before or after the tune?

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