Has anyone ever used one, the price seems very good if there half way decent, i'm running a Ram, but its giving up the ghost after 5yrs. & over 60K miles, starting to have issues with it at the track. I think it still has a stock flywheel but not possitive.

http://cgi.ebay.com/ebaymotors/F1-RA...mZ150300205511

Or this one.

http://cgi.ebay.com/ebaymotors/F1-RA...mZ170231208041