If you want aggressive, don't go with GT500's or the Magnaflow Street series. The street series is definitely one of the most mild offerings on the market, much less Magnaflow. Sell the whole set if you can. I'd get Corsa Extremes or the Borla ATAK Catback. if you want aggressive. The Comp's resonators are slip joint so just an axle back system won't fit without welding because most all kits are sold as ball joint. Get two Pypes M80 mid mufflers and have them welded in the over axle pipes right before the mid pipe.