There is an incredible difference before and after chipping your Audi TT 225 hp, in manual. It is really a day and night difference. My Audi TT 2002 225hp has been increased to 275/285 hp I have been told, and I believe it. It is 6 speed, and in 5th is has a nice KICK on the highway, and in 6th, it has plenty of acceleration noticibly due to this chip! Well worth the money! The performance of this Audi TT is unbelievable, and it make you want to take it to the Autobahn in Germany with no speed limit! Truly a most remarkable car at a reasonable price!