Compression Ignition Addict
Join Date: Dec 2008
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Stock is a dual walled 4" pipe that has an interior diameter of 3". So even though the factory downpipe may look like plenty, when you cut it open....you are VERY surprised to see how little space their is for air flow.
4" is the biggest that will fit, and is all that is really necessary in my opinion. I don't think we could really benefit much from a 5". No increase in cabin noise on my truck. If the downpipe fits properly (no rubbing), you should not hear any excess noise.
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2012 Ford F-250 Lariat CC/SB
Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights