the dude I bought it form ran 9psi at 3200 on a 2000si and the turbo map for the t3 on a .63 and a .48 both show the optimum rating ( the center island) between about 7psi and 16 psi, by the time I stand build a different b16 block I'll run a t3/t4. Holy shi* I just saw the price difference and I'll go with hondata, at least until the built engine comes along and I start rakin in cash with my bachelors.