Compression Ignition Addict
Join Date: Jan 2008
Location: Williamsport, MD
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there is no difference in performance between the two. It all comes down to the sound and tone of the exhaust note. The 5" will be more of a low end growl/rumble and will over all be louder than the 4". That's the only difference. Judging by you saying you want a softer exhaust note, I would stick with the 4".
Performance: SCT Xcal-Innovative Diesel, 4" Turbo Back Exhaust no muffler and kitty missing, Spearco IC, ID Power Elbow, AFe Stg. II Intake, 03 Turbo.
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Looks: Westin Black Powder Coated Bull Bar, Recon Smoked Cab, Mirror Lights, and 3rd Brake Light, 4" Superlift kit, 35" ProComp Extreme A/T's, 18x10 Diamo Black & Chrome Rims.