I've done both on my intercooler pipe from the cooler to the throttle body. It's been ceramic coated inside and out and then I heat wrapped the pipe all the way up and down.
I data logged the temp before and after the changes and both combined are definitly the go. If you sit at the lights by the time the light goes green the intake temps usually rise by around 12deg, now only 2-4deg.
This temperature change would shift make a change in the air intake temp V's ignition timing map and timing would be retarded. This change could result in a decent (~10-15hp) loss at the wheels.
Sun, 22 June 2003 02:46
