I would like to cool those headers as well, am thinking of drilling the baffles (since I wear ear protection, sound is not much of an issue). However as mentioned above, the ECU probably expects some back pressure, but I don't see a pressure sensor on the exhaust, just the O2 sensor.Hmmmmmmm....... More gas flow would affect the O2 reading, requiring a richer F/A ratio, which is a good thing. Lower combustion temps and more power, yes.
