Quote:
Originally Posted by RETed
Are the fuel rails cast aluminum or tube steel?
Cast aluminum = S4
Tube steel = S5
Also, JDM motors typically have the fuel routing backwards:
fuel line from fuel pump -> fuel filter -> *secondary fuel rail* -> *primary fuel rail* -> fuel line return back to fuel tank
The US-spec 13BT's always go primary fuel rail first and then secondary with the FPR in the secondary rail.
S4 = center iron
S5 = (rear?) rotor housing
Sounds straight up S4 to me...
-Ted
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one is cast one is steel.