Top mount intercoolers on road courses.

[Brad]

When truly testing intercooler effinciecy temperature drop would need to be compared, pressure drop over the intercooler as well as exhaust manifold back pressure. The continued reference to exhaust manifold pressure seems annoying but it is important. Never thinking about it until it was compared to before and after an intercooler change.
A lot of upraded intercooler do not aways flow more air, they may cool better but with the same or increase back pressure.