View Single Post
      01-30-2013, 10:53 PM   #21
shortseller
Lieutenant Colonel
shortseller's Avatar
United_States
137
Rep
1,821
Posts

Drives: 2015 SOM3
Join Date: Aug 2010
Location: NOVA

iTrader: (0)

Quote:
Originally Posted by BMWM.D. View Post
The thing that's really kept me from investing in the "is" muffler swap has been the performance gains, or lack of. A full downpipe-back system like HKS, ETS, etc. will give at least 10 rwhp for the effort, along with the sound. Plus you can keep your factory exhaust to go back to stock easily if you ever want to. I'm really loving the tone of the ETS system from the videos I've seen, so I might go this route instead.
Frankly, that too has kept me from the 'IS and PE exhaust, no bang for the buck.