MRturbo

my setup is Y8 engine:
Silly sohc ram manifold
t3/t4OE 57 trim .48 ar
3" downpipe to 3" catback no cat.
2.5" intercooler piping
Jrc 6" Ic
RC550
Tial 38mm
more stuff such as guages, boost control, hondata
all this on stock block..looking at about 200whp but hoping to up the boost to 300+whp after summer build. i just dont know if i should get the regular walbro 255 lph or upgrade to the 255 lph HP. i mean what is the advantage of the high pressure vs the regular walbro pump?

tilt

The HP just flows better at higher fuel pressures. There is a comparison graph of it if you look around. With 550 injectors, either of them will be fine for 300-400whp imo.