Compression Ignition Addict
Join Date: Apr 2010
Location: Lowell, MA
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I doubt tip size makes any difference at all if any. But a 5" system would be louder and deeper than a 4". Going without a muffler will make it louder than with one.
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2005 6.0 PSD XLT SD FX4 CC LB
SCT, SRL, Atlas 80, Arp's, Bulletproof Oil cooler w/ Cold weather package, All aluminum radiator, Bulletproof water pump, Sinister Full Delete, 4" Mbrp turbo-back, Banks Techni-Cooler, Banks intake, Edge insight CTS, Diesel site coolant filtration, CCV Mod.
2.5 Icon Leveling kit, 5" Icon rear block, Pure Performance adjustable trackbar, King shocks, PMF 3 link.