I really liked the eibachs, looks and performance.I was hesitant at first because I loved the stock handeling but they did a excellent job. I also like the Borla and the KKM. neither are intusieve nor threatining to the warranty.
SO I say Eibachs, KKM,orK&N, then Borla and a y-pipe. Then work on the pedel covers and say sill protectors s-knobs. IMHO