Modifications: the engine is stock, so far, air compressor eliminated, aftermarket intake, header and open pipe up to the cat-back, new ignition coils, Ultra ignition wires, aftermarket water pump
, big KOYO radiator & radiator cap, silicone hoses, thermostat eliminated, throttle body coolant hoses-bypassed, new racing beat oil cooler SS braided hoses, singular Motorsports hood louvers, racing beat PCM Flashing V2, racing spark plugs. I disassemble and clean the lower intake, valves and replace the APV actuator. One thing, I never change the fuel injectors and the fuel pump.I am not sure, but I believe that the engine is running too lean, and I said this because the S.S. exhaust pipe tips are changing in color and the interior of the pipe is clean with a brownish dust, not dark in color as in a normal combustion. Should I modify the thermostat case and close the by-pass to improve the flow? Need some guidance from the experts. Thanks