What is the first thing I should do if I want to upgrade this engine? I want to boost the HP but keep it street legal and emisions friendly, I am going to do a total cleaning of the engine and compartment and then do a major tuneup, replace all of the fluids and small parts, like plugs, wires, cap, rotor, flush the engine and the radiator and look for anything other things that need to be replaced. Any advice?