Stock exhaust.   <---Not bad for a stock exhaust system, but a little quiet for my tastes; recorded while car was on the dyno.

Random Technologies Cat-back exhaust.  <---  stock cam, stock exhaust manifolds and y pipe/cats, but with Random Tech cat-back; recorded while on dyno.

Above combo with B1 cam. <-- B1 cam, stock exhaust manifolds and y pipe/cats, but with random tech cat-back; at idle.

Above combo with hooker headers and mufflex y pipe with carsounds cats. <-- B1 cam, hooker headers, mufflex y pipe with carsound cats and random tech cat-back; at idle: