Put on a 4.6 2V , this turbo is huge compared to the PW T66 unit I had on before. But going from major back pressure issues at 10psi and spooling at 3500rpmbut falling off at 5500, this turbo is spooled up by 4000rpm and ready to haul the mail at 15psi all the way up to 7000rpm. If you're looking for a mild V8 build (450-600ish) I think this is a great option especially compared to the Borgs or Precision turbos which are 3x the price