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Damn bro that’s :whoo:

What you have done to it? Heard the tune for the M3/M4 makes a big difference
just a tune. Catless downpipes are next and have the tune redone. The primary cats are very restrictive on these cars so removing them will allow for more HP gains. Right now the car making over +75hp and +100 over a stock m3/m4
 

BaldingSoHard

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just a tune. Catless downpipes are next and have the tune redone. The primary cats are very restrictive on these cars so removing them will allow for more HP gains. Right now the car making over +75hp and +100 over a stock m3/m4

Did you dyno before the tune? I have a feeling these cars make well over the stated 425 hp.
 
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