12 an is kind of big but that the size of the 2035 weldon pump inlet ( i did'nt wanted to reduced, less amount of fittings) outlet is 10 an split onto two 8an and my return line is 8 an . also i was having cavitation issues with the tripple densos set up (only with 600whp and i am aiming for 800whp on e85). your friend probably running c16 that gas is out of my price range lol. The car should be done by next week (if i have free time) i just got to go to amazon hoses buy the fittings for the filter and 12an 90 degree female coupling and waiting on the weldon controler should be here friday or monday .