how much for 315 sumis, i have run 35psi but i'm noticing a little for wear in the center so i might drop it down to 30
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2004 Dark Shadow Grey 5 speed V6
MAC o/r H-pipe
Stock gt exhaust
Fog Lights
17x10.5'' bullits(from MT) in rear with 315 sumis
MT Cold Air Intake
Ford 8.8 rear end with 3:73 frpp gears
Mach 1 chin spoiler
Mach 1 Grill Delete
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