Compression Ignition Addict
Join Date: Nov 2009
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4" pipe wont do much over 3". The outlet on our turbos is like 2 3/4". Stepping up to 4" exhaust might let the exhaust gasses expand a little letting a little more gas out, but you will notice the most by ditching the muffler.
'05 6.0 FX4 Lariat DRW:ARP, OEM HG's, Fully Updated, 03 turbo, Warren 155/stock, Pillar Guages(Boost, TFT, EGT, Oil Pressure), Fuel Pressure, Scan Guage 2, 6.4 banjos, Blue spring, MBRP straight pipe, SCT with Nate's tunes, Zoodad, DIY CCV Mod, coolant filter, T6, Final Charge ELC, Strategy VXCF4, Eco tuned FICM
Ficm Repair.com is the $%^&!!!!!!! Great service, and Ed is great to work with. Highly recommended!!!!!!