i rcently did the exhaust on my car true dual exhaust fro the headers to the back with no cats and flowmasters on the end. trust me it helps u out alot. i got my exhaust done for $180.00 but i already had the flowmaster chambers. then i would do the 5% pulley on the charger i have it and u can feel the difference. im auto and 5spd 5.0s cant keep up anymore.