Cooler intake manifold

Cooler for power. Yep, every time at or or around peak HP & below that too. Anybody who has been driving the same car long enough knows the car feels more sluggish on very hot days compared to cold weather driving. That is the cooler air making more power. However, at cruising & low speeds, lack of manifold heat can cause poor drivability/roughness. Another benefit of cooler air is less chance of detonation. You should probably experiment, see how it works on YOUR combo.

Beware of spacer 'stories'. I know of one gentleman on another forum who claims his engine gained 102 HP [ not a misprint ] when he added a 1" open spacer to his engine.
For $25, said spacer would obviously be the hottest selling horsepower improver at Summit......