What are your plans? If you just want more sound chop the stock muffler and go straight pipe. The downpipe will then be your restriction. If you want a kit as Bruce said 4 or 5 will be about the same as they both have 4 inch downpipes with the 5 inch system starting the 5 inch piping after the downpipe.
Yeah, its more for looks than anything, I have a MBRP 5 inch straight pipe. I love it!
The only tip I can give you, and this goes for any size pipe, make sure you get the exhaust out past the weld on the bottom of the bed. If it is inside there even a little you will get an amazing resonance inside the cab. I removed my tip a while ago to fix something and WOW what a sound difference in the cab.
Just my $.02
Back from the dead... After a lot of searching through the various exhaust threads I didn't deem my question worthy of yet another exhaust-related thread and this thread's topic is directly related to my question: will 5" exhaust give me headaches in terms of fitment at my B&W gooseneck hitch? I wanted to go with the Flo Pro 5" kit without muffler if it has clearance at the gooseneck hitch, otherwise I would revert to their 4" kit. Thanks for any information yall can give me!
I dont see why it would have fitment issues there. I recently swapped out my existing and rotting 4 inch dp, 5 inch exhaust for a new stainless one. It was very very simple and plenty of room all around the pipe.
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