That's was one of my concerns with my 480 and why I went 70%, but my HP goal also is less than 800 (would be nice but towing/drivability>power)i played with a few different ones but yes, 100%'s. i think i finally settled on 1000uS for summer. it was like 480-500hp (felt neutered compared to before ) as i was tired of starring at the coolant temp. i could just put my foot to the floor and go. There was a fine line in enough fuel to light the 483 and not like Shane says. the 900uS i used at one point coming back from a trip would hardly get the 483 to do anything, 475 should work off that but not much lower. i never tried it but ive heard going under 800uS can be hard to tune part throttle.