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The MBRP (and most aftermarket performance mufflers) are a "straight-thru" design. Meaning the inlet and outlet are in line with each other, so the exhaust flow runs in a straight line from the inlet to the outlet. Your factory muffler is not like this at all (take a look under your truck and it will be apparent). So to put a straight-thru muffler on there will take some fabricating. Furthermore, if you put a 4" muffler into a 3.5" exhaust system, you are going to create turbulence/backpressure in the exhaust system (a bad thing). The turbulence is a result of the gases entering the muffler expanding from 3.5" to 4", then being forced to reduce again to 3.5". You would be better off to have a muffler shop fab you up a piece of pipe to simply replace the muffler and leave the rest of the system alone until you put on a full aftermarket system.
The "jet" sound you heard was from a truck with the 03 turbo. The 03 turbo has a considerably louder whistle to it than later models.
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 2003 Toreador Red/ Arizona Beige CC, DRW, Lariat, FX4, 6.0 PSD, Torqshift, born early Feb. 03; AIC; Silverline turbo-back dual exhaust; 155cc injectors from Full Force Diesel (Casserly); SCT with tuning by Tony Wildman (Total Diesel Performance) & Innovative Diesel; ARP studs; Dfuser regulated return; AFE PG7; Fumoto valve; B&W hitch, Di-Pricol gauges; DIESELSITE Coolant filter; Timbrens; Rancho RSXs; Michelin XPS Traction's; a whole bunch of "bling"; Connex 4300hp; Pioneer DEH6100BT; JL Audio 275w amp driving a 12" sub; JL Audio 50wx4 amp driving the Alpine door and rear seat speakers. 380.3hp/786.7ft-lbs (on my tow tune!)
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