Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 233 Times in 224 Posts
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straight piping the stock exhaust is good.
the downpipe is about 3 inches stock.
i bought my truck with 4 inch pipe after the stock downpipe, i switched to 4 inch all the way and noticed quicker spool up, about 50 degrees lower egts and more boost.
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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