I wanted the boominess out of the car so I decided rather than paying $379 for a flomaster cat back, I would go with jegs and buy the thrush mufflers. Car sounds awesome at idle, not as muscled at wot but still good enough for me. The cat back went on pretty easily and sounds real cool. Just make sure you DON'T tighten until it is where you want it or a PIA to get the mufflers on again. 2 1/4" 40 series (almost new) flows are going up for sale shorlty if I don't hear back from another poster who wanted them earlier.