3.5 21 pounds not 850 HP yet will be once e85 and crusher inlet goes on close enough anyway right now its got too much boost at 21 on stock pulley for pump gas putting out 660 right now but lowering pulley 3.25 when e85 tune is in but till then putting a 3.75 pulley on to drop boost to 18 lb stock lower pushing crazy boost
Sorry to chat on your thread but weird how boost varies from car to car. my whipple 2.9 on stock lower and 3.5 upper only made 16psi had to put a 3.25 and it went to 20 psi then added a 4lb lower now i see 25psi