The intake temperature is one of the most important factors in making power.
Hot temps have a snowball effect on turbocharged vehicles.
I told this customer his intake temps were increasing over the pull and asked if he had a box. He did not. He fabbed one up, slapped it on and the results speak for themselves. 27 degree cooler intake temps with the box.
Without the box the car was knocking and already down 2.5 degrees of timing due to the intake air temp timing compensation table.
With the box the car is knock free and running 2.5 degrees more timing due to the lower temps. So if you add in the 1.4 degrees the car knocked down.....that's 4 degrees of timing that the car has back.
Thanks to Bart K. for the pics and write up.