I went to have my 03 Busa dynotuned at BRG Racing in Pacheco Ca because it was starting to miss and the gas mileage went down to 15. The tuner said the fuel pump and pressure regulator were bad so he will fix that before tuning. My problem is that the oem part comes as a unit with pump, regulator and sender all in one for 870.00. I found an aftermarket AEM 50-1000 from Schnitz for a little over one hundred but it is the pump only, can't find a regulator for the in tank unit for an 02 to 07 Busa. The AEM unit is supposed to have an internal regulator set at 43lb so does not need an seperate regulator, but the install directions and photos shown on Schnitz site show the regulator still in place. I have not been able to talk to the tech department, nor has my tuner. The woman at Schnitz says they only respond by email? Anybody know anything about this regulator problem?