I would pick it up, the mandrel bends kit is approximately the same price iirc without the mufflers. The mandel bends kit does come with an x pipe though, not the greatest x pipe, I had to hog mine out when I got it. DynoMax has a nice sound to them, its no Borla, but still have a nice tone. You may also notice slight gain, not much though. Find some high flow cats if you want less restriction.
2004 QSM Pontiac GTO 1 of 889 245,00 and counting