Originally posted by Root
What is a lid and cutout for on the LS1? I would guess the cutout is an exhaust cutout? but what is a lid?
The stock air box has a lid on top of it that does not allow air to flow as smoothly as an aftermarket one. People have shown gains of 10rwhp and .1 / 1mph with a lid change on a stock car. Not too bad for $100