I recently bought a 2005 that has been tuned deleted and studded. The truck does not have a pyro installed and the guy that I bought it from said he ran it on canned street all the time and canned performance a couple times. I have now noticed that the downpipe is slightly discolored with a slight blueish tint to it. Do y'all think that is something to worry about? Is there anything else I can visually look at to check and see if it has seen high egt? I will be ordering a pyro soon just wondering if I screwed myself on this one. Thanks in advance.