I was checking out an issue of 'Sport Truck' and was wondering if anybody has tried one of the many FIPK setups(K&N, Volant, Airaid, etc.) they have advertised? Do they really make that much difference or is it a lot of BS? I'm looking to get just a little more torque and maybe better milage out of an '00 4.8L Silverado. Any suggestions? And don't tell me to trade it for a 5.3 or 6.0, etc. :nono: