Originally Posted by smotrs
The 5in will provide a slightly deeper sound then the 4in, but a 4in will actually out perform the 5in until your pushing huge HP numbers.
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Installed a 5 inch FloPro in conjunction with the Minimaxx and S&B air intake about 2 weeks ago. The exhaust was simple to install and fit very well. I was hung up on the 5 vs 4 also, but knew I would regret doing a 4 inch knowing something bigger was out there for a few pennies more. I checked everything in my driveway yesterday and the clamps held fine (as expected) and the truck runs great. It does sound like a jet with light acceleration going through congested towns...but does get attention. When you step up the tune and punch it, it comes alive....my two cents....