stock 5.3 tahoe except 2.9L whipple with 3.75" pulley and aem x gauge for logging (after primary cats). the 4.375" pulley made 450whp . wanted to make around 550whp so i changed the pulley. i read alot on here that the stock fuel could support right at 600whp before needing lt4 parts and or cams with fuel lobes
maxed out the SOI
added the max and desired HPFP up higher just to see if it would work
the IPW is pushing 8ms its maxed and the HPFP is falling off
any suggestions before i add meth?