This is the Pre Filter for the Amsoil Filter EaAU3560.
The part number for this Pre Filter is PF 11.
Before the install:
When I installed it on the filter it really is a tight fit to put on.
But it will not come off. Here is a pic before it went back on the MAF:
And now installed:
I went to Island Dragway to race with the ECIRS peeps.
I ran the car for a total of 4 rounds of racing. Opened
up the hood and you can see dirt/dust on top of the pre filter.
That tells me it is doing its job. I just used a rag to take
the dirt/dust off and it looks like new again.
About performance this is what Amsoil website says about it:
Will Not Block Air Flow
AMSOIL Ea Pre-Filters will not cause any significant reduction in air flow. In fact,
AMSOIL EaAU and EaAR Filters allow more air flow than the engine can process, so adding an EaPF will not prevent a more-than-adequate amount of air flow from entering the engine.
I ran a 12.42 @ 109.8MPH with it on

.