Walbro 255LPH Fuel Pump for Subaru WRX/STI is the staple fuel pump for the performance market. Chances are, if someone's selling a high-volume fuel pump, it's a rebadged Walbro. The GSS342 is capable of flowing 255 liters per hour (lph), making it unsurpassed for performance, particularly in a turbocharged vehicle like the WRX & STI. Housing MUST BE MODIFIED for fitment.