Dual Walbro's in a 1G AWD

[DB Performance]

By the part# on it. The 3 most commonly found families are the 190lph, 255lph, and the 255lph HP. You almost always want the 255lph HP on a DSM that is going to run decent amounts of boost. Each family will usually have 3-4 different variants of the pump. Like the GSS341, GSS342, GSS340 and GSL392 are all different versions of the Walbro 255lph HP, with different setups for the inlet/outlet for different cars. The is a 190lph HP also, but I have never seen one. There are also China/eBay knockoffs that are hard to tell from real ones.