How do the 351's compare to the s300G? The only complaint I have about my 57mm s300/13cmSS is that under 2000 rpm the thing likes to get the EGT's warm. Above 2000 rpm the thing pulls great will run 80+mph with no EGT problems. I have had 3 65mm turbine turbos on the truck and they all seem to have the same issue. I think the 62mm compressor I had on one actually did a little better. The issue I have is that 1900-2100 rpm is where I spend most of my time, so I have to monitor the EGT gauge. Of course it isn't getting crazy hot, but it will hit 1400 on a climb, and runs around 1000-1100 pulling flat. Maybe I should try the HE351. THe truck has Mach2's and a comp box that stays on 1x1 99% of the time.