This week the guys delve into the dark science of classic automotive restoration strategies. Between their own projects and the ones their friends are involved with, there's plenty of fodder for this mill too. Ray reports a good experience after using Rislone fuel treatment to resolve a P0420 Cat code in a family car, then explains the parts he needs to complete the A/C installation in his GTO. Chris takes us home with a neat repair on his Tracker exhaust system.