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[Taz]

I posted the differences between the various filter types before on the first aFe thread but here you go again.

"The difference between the "Pro-Guard 7" series filter and the "High Performance" series filter is that the Pro-Guard 7 features 5 layers of progressively finer mesh medical grade cotton gauze with micro fibers that attract smaller & smaller particles of dust and dirt as air passes through. The other 2 layers of material consist of random-porosity non-woven synthetic polyester fabric. This makes the Pro-Guard 7 series filter able to handle huge volumes of dust-laden air without clogging prematurely. This filter will give the same filtration protection as the stock paper filter, if not better and still flow ¾'s more air than stock. I recommend the Pro-Guard 7 series for construction vehicles, farm equipment, ranch vehicles, vehicles that are driven on dirt roads a lot. serious off road vehicles, or any vehicle that spends 50% or more of the time driving in dirty air conditions. The filter media is generally gold in color.

The "High Performance" series filter has 5 layers of progressively finer mesh medical grade cotton gauze with micro fibers as well. That means it will attract smaller & smaller particles of dust and dirt as air passes through just like the Pro-Guard 7 series filter. This allows more air to pass through into the engine, which will produce more torque & horsepower, but will still filter out nearly as much dust & dirt as the stock paper filter. I recommend our High-Performance series filters for vehicles that spend 80-90% of the time driving on the highway, towing a 5th wheel or travel trailer or a good size boat or any large load. If you drive in an area where you have a lot of grades to climb or in high altitudes, this filter series will allow the maximum amount of air into the engine for greatest amount of torque and horsepower. It will in fact almost make you believe that you are driving a gas motor vehicle, that's how good the throttle response is. The filter media is generally blue in color.

The Pro Dry-S filters fall right in between the Pro-Guard 7 series and the High Performance series filters as far as filtration protection and CFM rates."