On my 94 t-bird it was called a filtercharger. I don't know if I would get the same thing again though. The open element air filters are debatable, you suck in hot air, with the engine compartment filters, but you do get more air to your engine. I noticed a difference on the t-bird(mostly stock). I plan on getting a cold air kit, same type of filter, cooler air, better combustion. You should be able to hear and feel a little difference at higher rpm's, with either one though. Good luck, becareful when you clean them, easy with the oil!