Does anyone have experience with the 200 cell HJS downpipe on the F20.
My car is a 116i , will it need a tune after a downpipe and how loud are these things ! on a stock exhaust.
Does it make sense just changing the downpipe and does it really increase hp. :?:
P.S These things are expensive
My car is a 116i , will it need a tune after a downpipe and how loud are these things ! on a stock exhaust.
Does it make sense just changing the downpipe and does it really increase hp. :?:
P.S These things are expensive