Those bodies actually pre-date the HPI buyout of the original Hot Bodies company, based out of New Jersey. They Mark 2 is the HB Toyota GT-1, very similar in handling to the Protoform Nissan P-35, The Mark 3 is the HB Nissan NPT '91 which handled similarly to the Associated Nissan NPT body. Compared to the modern Proto, Parma, and Black ART bodies the HB shells would be lacking in downforce.