I've got the exhaust. It's not mandrel-bent, but the piping (2.25") is as straight as I could manage coupled with Magnaflow mufflers. There aren't any severe bends. Plus the cats are gone due to a busted left cat and the shop not having a replacement. I'd say the flow is as good as an aftermarket mandrel-bent system. It's an N/A. I'm not looking for gobs of horsepower right now. The JWT POP is just to free up the breathing a bit (plus I love the sound under heavy throttle.) Hard pipes aren't for HP either, not directly, anyway. I just want to add some shine under there.