I bought a BMW 335I?

i purchased a 2007 bmw 335i , great car, flyes like a butterfly with its 300 hp twin turbo engine, however i want to add more horsepower to it, how can this be done?

I bought a BMW 335I?firewall

get a new air intake and a new exhaust and remove the governer(limits speed)

I bought a BMW 335I?husqvarna

Replace the air filter with a freeflow K%26N filter if they make one for it. Get new exhaust.