Dynomax! I've got the 2.5" in/ 2.5" out with an integrated X-pipe and I love it!  It takes up less space as far as length. It think it = the other set up or was a little less than. There are less parts than 1 X-pipe & 2 mufflers, which means less welds. less welds = less $. With the same performance as the other. At least I feel it is the same. I have no testing to prove one over the other. I don't run dumps due to that is probably going to throw a sensor, but I do have 3" turndowns @ 45 degrees. Good luck.
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'7 F150 XLT FX2 SPORT
black/black, titanium, & red 4.6L/4 speed auto/ 3.55 rear diff:
"FX2" decal delete, 4- Sony Xplod 6"x8" 2way speakers, Sony Xplod 600w 4 channel amp, 13% tint, smoke tail lamps, smoke 3rd brake light, 14" black antenna, DJM 2" drop shackles, Whelen 6ch. module w/ 4- 60w strobes (heads & tails) & Dynomax Ultra Flow glasspack (2.5" 2in/2out w/ internal X-pipe)
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