Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 238 Times in 229 Posts
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the major restriction in the stock exhaust is the muffler , the downpipe is second, it is only about 3 inches.
a 4 inch system has a straight through muffle or straight pipe and larger 4 inch downpipe, so no restriction.
4 inch diamond eye straight pipe is 230 from alligator performance hard to beat it.
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99.5 f250 7.3 4x4 260k FF 160/30, PHP Hydra, S&B CAI, 4" Exhaust, RR Billet Wheel, Autometer Gauges, Transgo, Non-Ebpv Pedestal, High Flow Outlet, 08 Tow Mirrors.
Dad-2000 7.3 4x4 110k miles, Autometer Gauges, Superchips 1705, 6637, 4" Exhaust, BD Billet Wheel, TruCool Max