hey guys i have a 2002 audi a4 1.8t quattro VIN # WAULC68E62A118989 now i always buy my Parts from ECS tunning, according to thier web site they only sell a factory audi pump for like $400 that goes with my vin#, i would really like to buy an aftermarket one for cheaper

anyone know where i can get one that fits my VIN#?
why is thier such a differance in pumps between vin #?


thnx in advance Paul