NO evidence of coking? I'm surprised.

It would be difficult for me to look at a glowing red turbo and say, "Gee, I don't need to let that idle for a few minutes. I'll just turn it off." (bacon sizzling sound in the back ground).

If turbo timers don't help, they certainly don't hurt. $100 for a little extra peace of mind isn't a bad idea.
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Elvis