Hey guys,
Sorry if this is a stupid question or if this is answered elsewhere.
I'm thinking of getting the M4 exhaust and I just wanted to know if I needed a fuel injection controller / tune of some sort of if I could use the stock settings.
Obviously it would make more power and be better if I had the fuel injector, but I'm just trying to figure out if i can do it in stages or if it should really be done all at once.
Thank you!