In the tread about N E W Superlight cars from RCR there is some usefull info in post nr 99 http://www.gt40s.com/forum/rcr-forum-rcr40-rcr70-p4-mkiv/21819-n-e-w-superlight-cars-r-c-r-5.html#post196011.
I have searcht these Internet Links links, but did't find any info about upgradet internals...