E P I Vector Wheel -EPI casting Means What?

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I have a 14x7 vector wheel  with the  casting letters E P I .
I haven't seen EPI cast on a vector before so does anyone know what EPI means?
It's not PSI like air preasure and It's not CSI like Carrol Shelby International
It's cast E P I

This wheel takes a diffrent center cap then most vectors maybee it's the shelby style vector
instead of American Racing. The hubs diffrent looking.This vectors a unilug 5 on 4 1/2 -4 3/4.
Anyone else have E P I cast vector wheels and know more about the mfg code EPI???

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Pictures

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final pictures to compare the differances between 2 diffrent 14x7 wheels cast from diffrent molds or mfgs

[aussiemuscle]

My guess is they are cheap knock-offs. someone here will know for sure...

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The back of the EPI looks the same as a picture of a MADE IN USA CSI Carrol Shelby International 15x8.5 vector I found posted somewhere online.
So as far as I can tell the back looks to be the same as a Shelby and the front may even be the same as the shelby since the spokes have a curve to them.
I haven't seen many cheap vector wheels    seems like they all cost about the same no matter whats cast on the back of the wheel weather it's a knock off or major mfg company name.