Its just fine to use 6an throughout, i think Turbo8u's point was just that it overkill. I cant understand anyone who runs a 3/8 feed line and then runs another return line. The facotry line is 5/16.....are you afraid to use that as a return? In the end you only have to run one line...the 3/8 feed.

Terry

96 Eagle talon ESI
Star Stage II - Boost/oil/EGT gauges

97 Eclipse
Greddy header/evo exhaust - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: Apexi AFC, HKS EVC IV, 450 Turbo injectors, SFMU/return line, GSX Front brakes (need rotors)