I have the preditor 93 oct. tune and its the best bang for the buck and you don't get greasy. Takes about 10 min and can be returned to stock just as easy. The HP is felt immediatly and puts you in the 400+ range. You already have exhaust so you would see more gains. Man I feel like a pusher... " hey man can I interest you in some mods". But take your time and do eat.