Thanks for the tips, on my 06 Heritage, I installed a Stage 1, Power commander, and Vance & Hines 2 into 1 exhaust. Had the bike dyna-tuned and the exhaust turned completely gold\purple. Had the turning re-checked at another location and it was still as perfect as they could make it.
I talked to the Vance & Hines guys at the sturgis booth and they told me that a small % of their pipes gold\purple even when the engine is in perfect tune. I live in Washington state which hardly a high temp state.
Monolith