I take it that Blackbear and Diablo (via Diablew) are the only tuners for a 2017 6.2L Yukon Denali? And it would only be for the ECM, not the TCM? I am not familiar with HPTuners
GMC Borla Exhaust is a GM Spec Touring Exhaust. I had one on my 2015 Sierra 5.3L and it was perfect, not corse or rumbling but you could definitely tell the difference between stock. I just ordered one for my 2017 Yukon Denali
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