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Your downpipe is only going to be about 3.5" inches anyway. It will still flow more with a 4" after the cat. I recently got a 4 inch system.. the downpipe is 4" at the turbo, them it had a big smash in the middle of it to clear the firewall, so what the point in having a 4" downpipe? Long story short, the pipe runs into my floorboard, and they are now sending me a 3.5" downpipe(for more $$$) My advice.. buy name brand exhaust..
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06 F-250 x/c 4X4 sb 17" alloy wheels. Tri-fold tonneau cover, weathertech vent visor,Ford floormats and splash guards. HarleyD headlights, Duplicolor bedliner coated bumpers, 08 rear bumper and taillights, herculiner rocker panels, XM radio, bosch wipers, Recon smoked cab lights, Edge Insight w/EGT probe, winter front.
06/10 ARP studs, turbo back silverline, new head gaskets, new oil cooler, upgraded turbo drain, fuel pressure reg upgrade, coolant filter, high idle mod, harpoon mod, pre-pump spin on fuel filter,ELC coolant, 6.4 banjo bolts, CCV reroute.
Truck weight empty fueled up, 4440 Front, 3040 rear, 7480 gross. Hex VXCF4,
SCT w/customs tunes from Vivian at Quick Tricks and Matt @ gearhead
http://www.fuelly.com/sig-us/59122.png
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