do you have an egr delete? If so how thick are the plates? You may have a boost leak.
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691 Hp 1200+ Tq - 2007 6.7
TWIN TURBO DUAL CP3 2500 Bighorn 4x4 6-spd Manual, 64/71/14 over a S400, Airdog 150, ARP Head Studs, TS MP-8, Airbags with Dual Control Air Comp., H&S Delete & Downpipe, What EGR?, Valair Dual Disk, Amsoil Bmk-11 Bypass, 295/70/R17 Toyos on Walker Evans Wheels,
6" Aussies & Hushpower Muffler & DiProcol Gauges & 120HP nozzles (Installed!) Thanks to Wally At FTEDiesel!!!!! PMT is gone, Smarty is Gone!,
H&S TO THE RESCUE!

Black Maxx on the way.