I just placed my order with SLP for the loudmouth exhaust and some other stuff well here my invoice 
31060 - EXHAUST SYSTEM, "LOUD MOUTH" 2004 GTO W/X-PIPE - 1 at 599.95 each
73006 - BUSHINGS, 2004 GTO SWAY BAR LINK (SET OF 8) - 1 at 34.95 each
73005 - BUSHINGS, 2004 GTO REAR SWAY BAR (PAIR) - 1 at 24.95 each
100228 - THERMOSTAT, 160º LS1 2004 GTO/CORVETTE/C/K TRUCK - 1 at 19.95 each 54360 - FENDER COVER, W/SLP PERFORMANCE PARTS LOGO - 1 at 18.95 each
59399 - FRAME, LICENSE-PLATE W/SLP PERFORMANCE PARTS LOGO - 1 at 8.95 each
My car is waiting on axle bolts at the dealer which are supposed to come in tommorow so hopefully I will have my car back when these get shiped will post pics and a sound clip when finished
Im also in the market for a good H/C package but doing my research any one got some good recomendations?
31060 - EXHAUST SYSTEM, "LOUD MOUTH" 2004 GTO W/X-PIPE - 1 at 599.95 each
73006 - BUSHINGS, 2004 GTO SWAY BAR LINK (SET OF 8) - 1 at 34.95 each
73005 - BUSHINGS, 2004 GTO REAR SWAY BAR (PAIR) - 1 at 24.95 each
100228 - THERMOSTAT, 160º LS1 2004 GTO/CORVETTE/C/K TRUCK - 1 at 19.95 each 54360 - FENDER COVER, W/SLP PERFORMANCE PARTS LOGO - 1 at 18.95 each
59399 - FRAME, LICENSE-PLATE W/SLP PERFORMANCE PARTS LOGO - 1 at 8.95 each
My car is waiting on axle bolts at the dealer which are supposed to come in tommorow so hopefully I will have my car back when these get shiped will post pics and a sound clip when finished