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Discussion Starter #1
I have an 08 2500 and I'm going to go turbo back with stainless. Should I go 4 inch or 5 inch? I've heard that if your truck isn't pushing 600+ hp that 5 inch will actually rob you of hp. Also does the different brands really make that big of a difference in the sound? I want a deep low sound. MBRP exhausts sounds good on youtube, but other than the muffler being different isn't the systems just pipe?
 

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I had a 4in straight pipe turbo back, before my 5in and would never go back. 5in sounds so much better. a lot deeper throaty sound. As far as power..I really don't know. I'm guessing you'd never tell a difference unless on a dyno.. Good luck with whatever way you go..
 

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5" all the way sounds much much better. The pipes can be the same as far as material but some have welded clamps on them and fit better. I had a 4" went to 5" MBRP and never looked back
 

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Only thing that sucks is no one makes a 5" dual setup. Also 5" has been known to drone more running straight exhaust, from what ive experienced.
 

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give FTE a pm... best deal! If you drive alot or have the family with you alot definatly go with the 4", my 5" has a seriouse drone when my tq is locked or getting up to speed from a idle. Cruising isn't so bad...fyi
 

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Discussion Starter #6
Thanks everyone. I'll probably go with the 5 inch even though the price tag is a bit more. I would like to go with mbrp but they don't make a 5 inch in stainless. I guess I will have to go with another brand and just put a mbrp muffler on the setup. Will a 5 inch down pipe fit without rubbing/vibrating? Or do I need to do a 4 inch down pipe then 5 inch back from there?
 

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A 5" downpipe will clear. My 5" FlowPro with muffler doesn't drone, at 1000-1100 RPM it makes a bit more tone but not a problem at highway speeds.
 

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Only thing that sucks is no one makes a 5" dual setup. Also 5" has been known to drone more running straight exhaust, from what ive experienced.
Area gives you a pretty good estimate of flow, a single 5" has an area of about 19.63 square inches while dual 4" has an area of about 25.13 square inches. FTE sells a kit (I believe) which is 5" to the axle and then dual 4" to the tips. You wouldn't lose any performance doing this. A single 5" pipe flows about as much as dual 3.5" pipes, and a single 4" flows about as much as dual 2.8" pipes.
 

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Discussion Starter #9
I've heard that one side of the duals will eventually "sag" making the 2 sides uneven. They do look awesome new, but I'm going to stick with a single 5 inch
 

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Just curious but are you guys seeing a pretty big difference in horsepower/economy without all the emission crapola? My Pops is thinking of upgrading his exhaust cause he isnt happy with the mileage at all... 11-14 tops nice power though
 

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Why would buy a aftermarket 4" when it has a factory 4" on it??? You wouldn't see any difference, don't waste your money. Go with a 5" if you want to change the factory exhaust.
 

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Discussion Starter #12
ok now I need another opinion from everyone. I've decided to go single 5 inch stainless turbo back, but I can get two different brands for the same price. H&S or Flo-pro, both with a MBRP muffler. I guess my question is which of these brands has better hangers, clamps, ect.
 
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