BMW 335IS Performance Upgrade help
Ive had my 335is for over 5 months now and even though the power is amazing i'm looking for a bit more.
I don't have any experience with any tuning what so ever or what would be good for the car, what do you guys suggest?
I've heard good things about JB4, is there anything better? Also adding JB hurt my warranty?
I'm not looking for a 600hp+ car lol just something a bit more powerful but not too crazy because I dont want to lose my warranty.