well i can give you my experience with ati. i called and spoke to charlie gave them all the info on my eng and car. they said we will send you a 8in great send it. well it gets here i lose 60ft and im on the rev limiter 150ft before the stripe.their awnser was change the gear and raise the limiter. after a few more calls and arguing they sent me a 9in witch i had in the car before and now it sits in the cbinet for sale. i have lennys stuff in thee car and am going to get my lupo fixed witch was in the car before the ati.