Thought some of you may like this info. S13 DOHC fastback project. Has some good info on weight reduction, pictures, and build up. No, it's not for IT racing but it may help future builders; especially the pictures.

weight reduction
http://www.mysportscar.com/features/projec...vings/index.htm

entire project
http://www.mysportscar.com/features/...t240/index.htm