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I have no experience in the Roush Offroad kit. But I do have a flowmaster super 44, and I must say when I bought my two cats and took out the four stock ones it made it a whole different truck in terms of sound, mpg, and performance. The part number for the two cats is Magnaflow 94106. I got two for $40.00 a piece from performance peddler on ebay through best offer. It doesn't say what year your truck is, but in the 04-05 they have 4 stock cats and in the 06- they have 2. I just replaced my 4 with the two new ones. Hope this helps!
Brent
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2004 F-150 Lariat
Interior- Alpine iDA- X305 Head-unit, Alpine MRP- M450 Mono Amp, 2 Rockford Fosgate P2 Subs, Rockford Fosgate t1682c Speakers With Infinity Tweets.
Performance- Flowmaster Super 44 Muffler Dumped, Magnaflow 94106 High Flow Cats, DWV Intake Mod.
Appearance- AS 2.5" Leveling Kit, Roush Grill, 20% Tint, Fx4 Wheels, Bed Cover.
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