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      02-09-2013, 01:02 AM   #5
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Drives: F80 YMB 6MT
Join Date: Mar 2008
Location: USA

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2015 M3  [0.00]
2013 X5 50i  [0.00]
Originally Posted by guentherkapp
I found this on a web site
The Eisenmann Race performance offers a deep throaty exotic tone. This dyno proven system put down 16hp, and 11lb-ft of torque.
The link is

I searched extensively and everything I found says the opposite, no power gain.
So what is the truth?
The only thing I have seen are people coming out with big claims to the contrary but no data to back them up.

The test posted by ind seems legit. With larger connecting pipes and pretty much pass through muffler, It would seem reasonable to see some gains.
2015 M3 6MT | Yas Marina Blue, CF Roof, Cloth | Adaptive M Susp, 437M 19" Silver | Stripper
2013 X5 xDrive50i | Carbon Black | M Sport + M Perf, 333M | Loaded