i know this has probely be gone over a million times, but i got to ask anyways. Which 255 pums should i go with. I mean they got the focus pumps which are 2 speeds, then you got the 255 high pressure, and then the 255 returnless. which on should i go woth. i am making between 16 to 18 pounds of boost, but the draw back is it starts to ping really really bad. I really cant afford a new motor, but i can afford pumps right now. so which pumps should i get, what part numbers anything? i would be greatful with some help please