After an extended stay in California after the BimmerFest show, IND’s M5 finally returned to Chicago this past Monday. All of us at IND were eagerly anticipating it’s return, and took off to the Dynojet at AMS Performance to finally test the AMS catless downpipes.
Although our M5 has been a test subject for quite a few dyno runs already, the excitement to hear the car spin the rollers with a fully catless setup was almost palpable. The car started with it’s usual roar, and within a few minutes we were off and testing.
As predicted, the catless downpipes coupled with an Eisenmann Race exhaust system have given the car a very healthy increase in power. Our dyno results should not come as a surprise to any owners of catless F10 M5s, but are rather a confirmation of what most already know- the AMS catless downpipes completely transform the car!
Our testing found a peak power figure of 586 horsepower at the wheels! We’ve overlaid this new test run over our original baseline run with a 527 wheel horsepower result- the power gain is impressive throughout the RPM range.
Current performance mods
AMS Performance catless downpipes
Eisenmann Center pipes
Eisenmann Race 4x102mm tips
GruppeM intake
You can view our original baseline dyno testing of the car as it was delivered from BMW by following this link:
http://f10.m5post.com/forums/showthread.php?t=740823
OEM vs. AMS
