Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 250 Times in 241 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 261k FF 160/30, PHP Hydra, S&B CAI, 4" TBE, Van Turbo with Turbo Blanket, RR Billet Wheel, Autometer Gauges, Transgo Tugger, Non-Ebpv Pedestal, 08 Tow Mirrors, Trucool.
Dad-2000 F250 7.3 4x4 111k Autometer Gauges, Superchips 1705 (Tow Safe), 6637, 4" TBE, BD Billet Wheel, Trucool.