Compression Ignition Addict
Join Date: Jul 2011
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Well it depends on if you plan on doing downpipe or not. Your turbo downpipe stock is 3". Thus there are no power gains with any exhaust bigger than 3". If you do the turbo back, the biggest downpipe you can get is 4", therefore 4" exhaust is functional, 5" is just for sh!ts and giggles. Only difference is sound.
2002 CCLB F350 7.3L 4x4 Lariat. Black with 2007 Tan leather interior. Mild towing tune, K&N CAI with sleeve, MBRP 4" exhaust straight pipe.
Kettering University off road diesel enthusiast
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Last edited by The Stig; 12-18-2012 at 09:44 AM.