This is a street driven car, right? If so a little back pressure= a good thing...for overall drivability, torque, and throttle response..IMO, and do you really prefer the way open exh. sounds over a nice low rumble...Not trying to flame you or critique your preferences, but if you want a free flowing exhaust try this..vikingpower said:
full length headers, mac 3" pro-chamber, spintech, flowmaster, or MAC mufflers ( your choice) with dumps.....I have not heard too many other cars that sound as bad ass at that!