The fastest Time Attack class car (ie apart from actual racing cars) around Tsukuba is Under Suzuki's S15:
Shows that the S-body chassis and the SR20 can still cut it against the best of the best in 2012, 24 years after the basic design came out with the '88 S13 Silvia.
Story - http://www.speedhunters.com/2012/12/...ki-52-sec-lap/
Video - http://www.speedhunters.com/2012/12/...-for-a-record/
(apologies if this was posted elsewhere, I did search but no hits)