2004Stang

I have a 2004 Mustang GT and I want to improve the performance and give it a sicker sound. I have already had the headers replaced (BBK Shortys), Exhaust (SLP)and a K & N air filter. What do I need to do to improve the sound and the performace?

techmanBDsStang

Um, this is the 05+ technical section, maybe you want to go to the section for your year model.