ive had my car since feb 2013 and im just trying to figure out if what i did was a good idea. f30 335 - i put flowmaster mufflers on it, i didnt wanna spend for a full system. it sounds good, turbos are louder so i guess theyre breathing better? i recently got downpipe and jb4 stage 2 and the car is a monster. huge difference. im pretty sure i have the fastest f30 around my area, lol. let me know what you think