Bottom image is a stock C6 Z06 aircleaner, seals off most of hotter engine bay air flow

Halltech - high costs, making big performance claims.

They also sell a "hole" you cut in lower part of shroud claiming better quality of air

Bottom image is the filter they sell and their overblown airbridge made of cheap plastic that retains heat and the total package has zero mounting and forces airbreidge to stand up higher then it needs to be.

Test results using a OBD-II scanner recording engine parameters and conditions from street to drag racing show this setup still allows all the hot engine air to be sucked into that filter thus the gains are zero as to what the total package costs.