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I would do it once and do it right. You can simply replace the muffler to a BTM unit but all you have done is move the choke point to the downpipe. You can get a 5 in system but your downpipe will still be 4 in because little more can fit in there without some real work. I am happy with my 4 in MBRP which goes from the turbo back and is 4 inches. It lowers the EGT because of the lower restriction in the downipie when it goes from a stock unit to 4 in mandrel bent.
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01 Excursion 7.3L Powerstroke. Gauges with AIH Delete, AIS, CCV Mod, 4' MBRP, BTS Trans, 6.0L Trans Cooler and Intercooler, DP-Tuner F5 chip, ITP In Tank Mod and Boost Annihilator, Diesel Innovation's Regulated Fuel kit, BTS Big Oil system, GTP38R Turbo with 1.15 A/R housing and BPD Stage II AC injectors. Bilstein Shocks with U code front and A code Rear.
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