usually depends on the manufacturer's specs. I wouldnt know specifically if the SP2 fits the SP1 axle back, and if you were to purchase the axle back alone, its probably meant to mate to your stock B pipe, not the SP1 piping that you already have. your best bet is to call greddy tech support.
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Last edited by Spec R; 01-15-2009 at 02:43 AM.