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
All other aftermarket mods
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2014 F20 116i M sport manual HK audio 18" BBS CH-R Lightweight Performance front lip Storm motorwerks V2 titanium gear shift FTP motorsports intake and charge pipe Wagner Evo 2 Comp IC