I might consider a turbo timer or even this brand of coolant which David Hayes uses in his newly built Single turbo 20B rx7 and notice a significant temp drop of 11-13f
http://www.engineice.com/automotive/
All 9s ngk plugs
Spark plugs were installed in January. I've done 4-5 autocross events, Deals Gap, mainly run on 93 non ethanol, use 20/50 idemitsu oil, and 1/2 oz per gallon of Idemistu premix on every fill up of 16 gallons.
Untitled by Gerald Mugar, on Flickr