In STS what are the rules for replacement radiators?   I need to replace the AL/plastic one in the car.  I would like to get an all AL radiator (not the Fluidyne high performance) but will that bump me from STS?

All AL, OEM type

http://store.summitracing.com/partdetail.asp?autofilter=1&part=PLI%2D439500&N=700+4294907534+4294907533+4294924666+4294924500+4294810996+115&autoview=sku

 

 

I remember wondering about the same thing for STU.  And I recall the answer being no, not legal.