4" exhaust, I don't think you will see any gains. But I do like the sound a lot better. Not as much popping from the exhuast. And if you do more upgrades, you will benefit from it.
6637 filter is pretty cheap and worth doing.
Zoodad mod....don't know if I gained anything. I just like tinkering with my truck.
Shim the fpr to provide a better fuel supply for all 8 injectors.This can be done with just a screw. But you might want to get the filter bowl gasket kit. The gasket behind the compression nut was desintigrated on mine.
Wicked wheel, $75 and prevents surge. Cured mine 100%.
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01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
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