[caddycruiser]

Depending on the car and the design of the intake, usually it can be anywhere from 2-20'ish, the upper end being if the stock design was really bad and you also had custom tuning done afterwards with the new setup.

Otherwise, a lot do actually give a bit crisper throttle feel, and even if not, there's usually just a more vocal air sucking sound that was originally muffled by OEM. Don't expect much, but the tiny improvements are usually still nice.