How true it is to have to race at 6500 feet elavation, it sucks, where is the air . I am going to change out the Air Intake System and go to 75mm but just wondering what manufacturer I should go with
Accufab hands down, that is, if you're talking about the TB/PL. The air intake portion of that (the tubing) really doesn't matter a whole lot.
And 70mm works better than 75mm for N/A, although maybe there is some kind of exception for this sort of air density? My head is not awake enough to think through this one right now, sorry