On the air intake...
There are 4 areas in which to pull air.
1) Factory outlet to fender. With the fender liners removed, you now create a vacuum which pulls in sand ( off track ) and rubber ( getting pushed to outside of turns ).
2) Aftermarket cone. Higher costs since removing the air box and replacing with an aftermarket part.
3) Fog lamp - simple setup, but if tailgating, you are now pulling the front cars exhaust.
4) Left turn signal - best are to pull clean air without major modifications. It costs about $15 in parts and 30 minutes. If I can do it then know anyone can.
W have examples of the different methods we have tried in the Southeast and we have seen no perceived difference using the long back straight of RA.