Just put the LOC on my 07 spyder to freshen it up a bit, I listened to them all and kressigg was the only one that was slightly better at more than twice the cost. Whoo what a difference, the night I picked it up and heard the LOC for the first time I was sooo excited i could barely sleep :>) Guess It's more about how you drive the car, but going with the larini straight pipes will cost you some of your low end torque and may shoot the flames but the power loss was'nt worth it to me! Honestly the LOC is the best bang for the buck in my opinion.. Take Care