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The GMPP parts are $$$ and not worth it. I've done Borla cat backs and high-flow CATs(Random Technology) on other non-GM cars and dealer just voids exhaust warranty, not entire powertrain.
Sometimes, they get picky on over-oiled filters and MAF sensors issues, but wash and re-oil new filters that usually come drenched. Hoping CAIs have AEM substitute or some other type of dry filter.
I'm not sure when GM gets involved with dealer warranty work since my last GM car was in the 80s. I'd like to wait a year or so to break-in the car before I say... hell with the warranty and do FI. Figure most QC problems will be addressed by then.
Looking at DT Shorty, MBRP 3" CAT-back, CAI, and shifter.
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