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.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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