Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 233 Times in 224 Posts
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a few folks have had issues with the mbrp kits. the downpipe occasionally hits the firewall. but most seem to be happy.
i bought 4 inch diamond eye and i really like it, install was easy and i did it by myself in my driveway. been on a year now and it still looks new.
4 inch is fine up to like 450 hp.
5 inch is just a little deeper sounding no performance gains over 4 inch.
so its entirely up to you.
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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