A few years ago I tested end plates in the A2 wind tunnel. The data shows that there wasn’t much difference between them, and I may have drawn some hasty conclusions about that.
The fact is, a hatchback with a 55” wing is not the ideal playing field for this type of competition. The combination of a short wingspan and an odd C-pillar vortex coming off the hatchack roof may have polluted the air right next to the end plate. So this really needs to be tested again on a proper coupe or fastback.
I’m going to the wind tunnel on 5/18 and 5/21 with two good candidates, a BRZ and a 944. We’ll be using a much wider 68” wing, and will test end plates for realz this time. (Also, I may have space for one more car, contact me if you are interested.)
So here’s an open call to everyone who makes an end plate for a 9 Lives original (now Express) wing with 4 holes on the end. Send me your end plates and pay for return shipping, and I’ll send them back after the test. I’ll publish the report and send you a copy for free.
I don’t want to leave anyone out. So if you don’t make an end plate specifically for this wing, but you want to be included, I can drill and mount your end plates accurately, to your specifications.
Mail to:
Mario Korf 137 Hopkins Rd, Ithaca NY 14850
Occam's Racer 
The overall effectiveness will surely be dependent on how the end plate interacts with the body structures of the vehicle in question, such as in-washing air from the flank of the car to then flick off a 944’s integrated hatch spoiler.
You will likely find that a particularly uniquely-designed plate will act very differently on a BRZ vs a 944.
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I suppose we shall find out!
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Mario,
As I mentioned, you are welcome to my rear wing/end plates. Or – you can take the whole car. I’ll be on vacation, but I trust you to take it. Let me know if you are interested.
Phil
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