View Single Post
      08-17-2011, 10:39 AM   #5
aberdeen
Enlisted Member
 
Drives: 135i
Join Date: Aug 2011
Location: California

Posts: 39
iTrader: (0)

less back pressure to a point will be more efficient and can increase mileage. Usually right after you put on exhaust your mpg's go down because you drive faster enjoying the new sound lol
aberdeen is offline   United_States
0
Reply With Quote