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Had the Gibson cat back as well. Gave me a headache between 70-80mph. Plus the damn thing rusted to hell after 7 months with no salt on roads this winter. I got the stainless too. Not a good quality. I think it was 409 stainless not 304 which is much better. Threw stock exhaust back on.
I just purchased a 16 Yukon Denali and am looking for recomendations on Exhaust systms to enhance the 6.2l sound, as well as reputable sources of lowering kits.