My first experience with an air intake was before there was an air intake.   I was tuning up my '68 GTO (points, plugs,
condenser, timing) and before I put the filter and housing back on the carburetor, I decided to take it for a spin around the block.   That's when I felt the instant throttle response and the awesome sound.   But I realized, of course, that I had to put the filter and housing back on to keep the engine from breathing in a lot of bad stuff.   That was then and this is now.  Over the years air management has evolved into a science.  Air intakes are one of the easiest and most cost effective ways to increase horse power, torque, and throttle response:  It is one of the first steps on your "to do" list for upgrading the performance of your vehicle.   The idea here is to get as much cool dense air into the engine as quickly as possible; this is accomplished by the use of a high flow filter and an air box with a wrap around heat shield (or cold air dam) to keep out engine heat.  Things to consider when buying an intake:  The filter must not create air flow at the expense of inferior filtration; the intake tube should be constructed of a non metallic material that is less affected by engine heat (stainless steel and aluminum look great but defeat the purpose); although there is an initial expense, keep in mind the filters in these intakes will be warrantee'd to last the life of your vehicle, and the cost of replacing OEM filters at recommended intervals adds up quickly.
 
Making a choice between aFe and Airaid was so difficult, Greyhound Performance had no choice but to sell and recommend both products.