it's a tad warm no doubt, but nothing to worry too much about if it's for short bursts... the 6.0 is more tolerant to EGT's than most people realize..
i've had mine at the 2000* mark on more occasions than i can count, and 1500-1800 was a daily thing just driving to work when i had my VGT unit, even with my VGTSS, however i think my old injectors were to blame also,
BUT I AGREE with the gears for sure !! i'm only running 35's right now and i'll be doing gears to help with EGT's .. it's the load on the engine that makes the biggest impact on EGT's with these PSD's.. i know people say EGT"s climb relative to RPM's, but it's just not so on the PSD's.. if you drop down a gear and pull the same speed at a higher RPM, you will see your EGT's drop, and the gears will help enormously for sure..
if you get a NONVVT, get a smaller turbine housing for quiker spool up and this will help with EGT's , you need the boost and airflow to lean out the burn and drop the temps. water/meth is also good..
i got the large turbine housing and at low rpms the egts can get up there due to no boost until it spools, however once it's spooled, NO problems.. on the highway at full throttle with 200cc sticks at 46+Psi the egt's don't go over about 1400max, and i've run my motor at 1400* for extended periods with no damage..
to sum it up... get a true 4" downpipe like silverline this helps
gears
water/meth