Air injection system
I have seen a post on this but have not been able to find it. The complaint I hear is popping on deceleration. I don't believe AIS has much affect on performance since is simply injecting air into the exhaust. There is a post here dated 05-05-10 that deals somewhat with this subject but not removing it. Go to page 2 and take a look, It has a link to a good article dealing mostly with fuel management to solve the popping problem. Titled Popping and stalling.