here is the spec of my s1 fully lightend and balanced bottom end,shot peened rods arp bolts tuffrided crank 0.5 over bore useing low comp pistons stage 3 head big valves [stainless] ported and polished,kent cvh 37 cam,double valve springs ,efi inlet manifild,803 green injectors fse power boost valve gotech management radtech front mount inter cooler samcos swirl pot baily breather,im on a run in map at the moment,ill be runing 20psi any ideas please cheers