Not sure on the size.. But I have the 6psi and 7 psi for the p1..
Fixer probably has one 239-980-6257
Fixer Motorsports Custom BuildArrington 419,Procharger P1SC H.O. Kit, Indy Heads and ported intake full polished,Arrington Billet 90mm with Nitrous, PPP race warrior cam,Johan email tune,Kooks coated long tubes, Paramount Performance TCM,Valve body Stage II, Fixer Motorsports Custom Fuel rails, Fore Hat,Walboro Pump,Pro Edge TC,DSS 1400HP axles,Quaife Diff,Widened Factory wheels 315 VREDS,Billy Boats full polished exhaust, KW's Coil Overs, Valentine one, Limo Tint,VIP Mad eyelids,JL W3 and Amp.
Have every size