If you're talking about the SHO Shop y-pipe ... there's only 1 gasket there on the back end. And yes, it's 4 & 11 to reset computer.
Black 98.5 SVT w/ KKM intake, 73mm MAF, ASP pulley, Optimized stock Y-Pipe, 24mm hollow rear sway bar, Magnaflow resonator, Magnaflow mufflers, Roush springs, KYB struts
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