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5" would be a bit of a deeper groan than the 4".. What year do you have?? Mine is an 04,, and I have the 4" MBRP. I went with out the cat, and muffler. It is "Turbo" loud. But that is the year I have,, many wont do this as bad. But,, I kinda like it. It does keep my EGT's down. Its a diesel,, they are known for noise. People will get over it! My neighbors did! LOL.. I like the 4",, people say that there is NO gain between the 4", and 5" for performance. Just loudness, or a deeper groan to the exhaust. So, that is my 2 cents. Good luck!
04 ~ F350 Crew Cab 6.0 4x4
Swamp's 58 volt FICM.
EGR Delete/ Bullet Proof kit
MBRP 4" Turbo back straight pipe
SCT tuner~ Custome tunned by Innovative
Warrens 205 cc Injectors
Garrett Powermax Turbo
Banks intercooler/ wide mouth intake
Driven Diesel Regulated fuel return kit
Fass fuel pump
S&B cold air intake~ "oiled"
Ford OEM head gaskets
ARP head studs and bolts
Edge Insight~CTS Monitor With Pyro kit.
SNOWS~ Stage One Methanol Injection Kit
Cepek~Torque Rims / Cepek Tires