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RB system is 100% the way to go on an NA rotary. Just listen to Zach's!!!!
I had it and loved it, only changed mine when I went turbo to free up a little more HP. That being said, the RB had a way better sound, and of course I used the RB downpipe and pre-silencer with the Apexi N1 EVO.
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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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