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			I think you might be OK with the CS->RB set up.  I am using an RB DP and silencer to Apexi N1 EVO catback and it all fits perfect.
 And a clogged cat might be your culprit for the spool, but I can't help too much as mine is an S5.
 
				__________________1976 Mazda Cosmo RX-5
 1976 Mazda Cosmo RX-5
 2003 Toyota Tundra TRD
 2015 Toyota 4Runner SR5
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