I dunno if this episode is a rerun and thus old news but they had a Satin Silver 05 GT, brand new and stock aside from a set of Richmond 4.33's. They added the K & N CAI which netted 10 hp at the rear wheels (they re-inserted the HC trap, go figure?) and then added a set of flowmasters which netted 6 rwhp. They did not reflash. Lastly they added a Zex N20 system which is tailored for the 05 for another 75 hp (with a pretty neat machine gun style purge system:eyepoppin ).