View Single Post
      10-19-2019, 08:41 PM   #32
alohasurftoad
Colonel
United_States
1165
Rep
2,273
Posts

Drives: 428i gran coupe
Join Date: Apr 2015
Location: hawaii

iTrader: (0)

Quote:
Originally Posted by zeyad.habeeb View Post
Don't you need to tune it after putting the down pipe ?
both, fabspeed and cg precision ds-1, are high flow cats that do not trigger a cel, can run standalone without a tune and provide a decent gain.

flash tune and catted downpipe together will yield more gains.

of course, if you elect to go catless then you need the flash tune to clear the cel that will be triggered.