I have the thrasher, scaned my 99GTP today and these are my numbers, if you are looking something to compare to.
Car sitting in sun all day, started up, car running idle for less then 2 mins [had to start up the scanner] = 21* over ambient.
Driving at 75 mph = 6* over ambient.
Sitting idle after 5 mins of moderate driving = 28*
If you ask me 6* over ambient is dam good considering this is a cold air intake and not a fender wall intake. Also the air takes much longer to reach the engine from the fwi. Maybe my logic is wrong: its easier for a human to breather from a 2" peice of tuming rather then one thats 2' long wouldn't the same logic apply to an engine? [enlighten me].