A lot of people who run road courses don't increase the size of their top mount intercoolers because they tend to become interheaters in these situations. I have found that with any size intercooler that WI always performed well in managing intake temps on road courses. This would seem like even more of a reason to stay small on intercoolers with WI given the decreased pressure drop. This would also be a reason to keep the IC top mounted - the routing is much shorter and the pressure drop and lag is a lot less. With water injection controlling the temps everything should be good. I really need to try it without an intercooler at all sometime.