modded ws7 and s7 pipes??????
which is the best pipe for fuel mileage for each of these engines. the pipes i have to chose from are:::
rb 2045
rb 063
rb 053
jp-1
jp-2
jp-3
ofna 086
ofna 053
i also have a variety of header lengths also..........
from these choices which gets the best mileage???? thanks jeremy