The Renesis is still a 13B with different mid and side plates but the housings still have "13B" stamped on them and leave the exhaust P-ports un-milled. I say the Rx-8 but I am biased. If there are turns I guarantee the Rx-8 assuming the Rsx-S driver isn't an amazing WAY above average driver and the Rx-8 driver knows a little bit about what he's doing.