I know of a decent amount of people having problems with the SP muffler rusting out. I don't know if that problem has been addressed with the SP2. I haven't had any rusting problems on any of the piping on my Apex'i.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget