Yes, design is important. NACA ducts, the 'reverse scoops' are either nonfunctional or worse (open and leaky). A fresh air intake setup might be nice ('ram air'?). Other than that, a slightly bubbled hood would help airflow in the compartment and keep the intake cooler. One would think an improvement of the orig hood was in order.

98 CSVT, basic mod's, my slowest car yet but still faster than the wife's Talon Tsi AWD. Not by much, though. Now if I could get the back wheels to do something....