Need help identifying this turbo.
 

Need your help.. I have purchased this turbo for a 1993 Mazda Rx7 years ago and would like to get the specs for it. I cant seem to find a maker because it was custom built from SPD Racing (SPECIALTY PRODUCTS DESIGN INC.) It has a 5 inch intake housing .96 A/R on the exhaust side and very little other markings. Any help would be great thanks.. See images. If I need to measure housings to get more information please let me know.

http://www.speedworksmedia.com/images/3.JPG
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it reminds me of a gt35r, 60-1,T67 from its front(and there intake is around 4") but i look like t72(ported to T74 or a T4 T88 but someone correct me if im wrong

http://www.mjmturbos.com/images/KICKASST72T74.jpgor a lesser version of thishttp://www.mjmturbos.com/T90-96ar60T90.jpg