only ran a little bit today on the way home.. im kinda skeered of it lol really.. so i ran on 4 for a couple miles and a few stop signs.. made 31psi pretty easy, the box doesnt add power until 2psi so if you had it floored it would smoke a bit, not much but you could see it in the mirror(trying to see how much it would smoke too).. it would start to spin a bit over bumps at some descent speeds that come fast at only 16k.. then i turned it down to 3 and drove it that way the rest.. only made 29psi that way but still runs pretting good. had one stretch that saw 1000 degrees.. ill know what its really about tomorrow i have a load to fresno, i reset the mileage also so we will see for real how it drive with a load and what happens with mileage..