Did before and after dyno runs with the install of the Eisenmann Race exhaust. Would have posted dyno runs but they were virtually identicle with only a few horse power increase but Im sure within variance of back to back runs. 420 peak rwhp and didnt get a torque figure. Exhaust is a little resonant at certain rpms but overall sounds better than stock. Sounds sorta of like a cross between a viper and say a 360. Definitely not like the gallardo (unfortunately).