For the Indy 500 EFI and the RXL's there is a Fuel Pressure Regulator that works for 22 bucks. Same bloody thing. I bought one a couple years ago and the thing works perfectly! It was this one below. Doesn't shock me that sled manufacturers are using a car like a Nissan for their fuel pressure regulators. Heck for the fuel filter on the EFI 500s and the RXLs they use a Fram G4777 or equivalent which is also off a Nissan or Isuzu or Mercury.