I had already removed the rear cats, last week I had the Resonator removed ($60). The sound at full throttle is great, a true euro sport tone. The sound at half throttle or a steady 70 MPH isjust crap, too loud, droning and just crap. My consistant 8.00 1/8th fell to a consistant 8.13 in similar conditions, I am assuming this is due to lost torque. I am considering reinstalling the resonator and would not recommend this mod when combined with removed rear cats.