This is our baseline starting point: 339 WHP and 262 lb-ft of peak torque to the wheels. This car was already equipped with a Corsa cat-back exhaust, and an AFE intake. It looks like the V8 wants to have a fatter midrange, but that factory dip from 4000-6500 RPM (a rather important RPM range in street driving and road racing) kills about 10-12 would-be lb-ft of potential torque fun. In researching other dyno graphs with other aftermarket tunes, it was apparent that pretty much all of them weren’t able to straighten that midrange torque curve out. We will see how the Epic tune fairs.

Here’s a look at our baseline exhaust setup, which includes a stock exhaust with a Corsa cat-back. The car already sounds wicked this way.

This is the section we will be changing out, which includes the factory X-pipe, cats, and a pair of resonators.

In its development of its Racing X-pipe, BimmerWorld didn’t just call Magnaflow to have them send out an X-pipe and weld some piping to it. The first iteration used an X-pipe with a larger internal diameter (left). In its quest for more midrange torque, BW tried an X-pipe with a smaller internal diameter, where they found a few more lb-ft of torque with this second iteration (right).


Previous Page Page 2 of 9 Next Page
Bookmark and Share
Tuesday, February 27, 2018 11:07 AM
Epic can't delete the rear O2 sensors with the software? Then you could eliminate useless bungs... I have an Epic tune on my S52 and Randy deleted the rear O2 sensors.
Mike Kojima
Mike Kojimalink
Tuesday, February 27, 2018 11:18 AM
Wow great results!
Tuesday, February 27, 2018 11:39 AM
I got all the way to page 9 and no vid?
Big Mig
Big Miglink
Thursday, March 01, 2018 7:39 PM
This was the worst V8 sound tease ever. All those set ups...
Friday, March 09, 2018 8:58 AM
I am honestly most impressed by how good the factory stuff looked. Serious question though, if I am reading this right you only picked up 10WTQ from this x-pipe combo? This is a street driven car, is 10WTQ really worth deleting the cats? I feel like some combo of this X pipe with high flow cats would be ideal.
Post Comment Login or register to post a comment.

MotoIQ Proudly Presents Our Partners:

© 2018 MotoIQ.com