Redarding EGT, how about useing one of those hand held infared thermometers? They ae getting cheap...I use mine to check the BBQ, but racers use them to check tire temp across the contact patch. Seems like you could drive up a long hill and look at each part of the headers.
Here's the first link I came to....
http://www.cabelas.com/cabelas/en/templa...requestid=50003Leif
