i have a 2000 lightning and i have on there now a 2.80 s/c pully, was wonder if i can do a lower pully 4lb safely, i heard that you dont want to run more the 15lbs of boost on stock motors. is this true???it runs about 11lbs now. any help would be great. all so lookin to do the preditor tuner, and tr6 plugs and the lower pully any input would be wonderful thanks.