I'm use to my dsm, 4g63 motor and am new to these. My motor has pulleys, the Apexi dual intake and apex power fc. What do I need to add a greedy bov or tail bov, and does it need to be recirculated... Do you have a link by any chance.

 

What year RX-7?

Edit..Oh, sounds like an FD based on your existing mods.

There are plenty of BOV kits available for the FD which are bolt in. Check any of the vendors. Doesn't need to be recirculated.