I suppose a more pertinent inquiry would be...
are clever and comprehensive aero packages in the works for the SL-R & SL-N?
I believe Nirvana Motorsport was working on some aftermarket body parts for the SL-R. I'm not sure where they are with that. I highly recommend a front diffuser for the SL-R for higher speed driving (above 120). Other than that, it's a solid car. I don't think the SLR or SLN were built for high speed running (150+) anyways.