Compression Ignition Addict
Join Date: Jul 2013
Location: Centerport, PA
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I thought I read somewhere that the 6.0 needs correct exhaust back pressure for the variable turbo vanes to work right, but it didn't really matter in a fixed vane turbo. Their summary was that 4" was a good choice for the 6.0, whereas 5" dropped the pressure too much. I also read that getting the 5" down pipe in can be a pain, possibly requiring firewall revision.
I can't find where I read it, nor do I know if it was correct information, but perhaps worth some research.
2003 Excursion 6.0L 4x4 (w/o rear HVAC)
Insight CTS w/ EGT probe/fuel pressure/coolant pressure/Backup camera
Gearhead SRL tune w/ SCT x4 | Ed's FICM + PHP Eco | River City EGR Delete | Blue spring | DC Power 185
Rotella T6 + Archoil | Optilube XPD | Zerex ELC and DFUser Coolant filter
Hankook Dynapro ATM RF10 | Silverstar ZXE | Excursion high idle mod | Viper Remote Start
Last edited by ynpmoose; 09-11-2013 at 05:23 AM.