Hello, I am about in the same boat right now. A few slight differences... I installed the corsa performance ca-intake on my 2020 sierra at4 right after I bought it. It did not work out very well. Check engine light was on constantly & it got WAY too much air with it! Nothing but trouble. Removed it & put the stock intake back on. Now I'm receiving a roto-fab cai this weekend & look forward to see how that differs from the corsa intake. I read really good reviews on the roto-fab so I'm going to test it out. For the exhaust i will be getting a borla atak cat back in the next few months.
Im not sure about the gm intake.. Have heard good & not so good with them..
I look forward to hearing how yours works out. I believe you're on track with the borla atak though! Seems to be a great option for these trucks. There are a few videos on you tube with the borla atak that I have seen & I liked the way it sounds!
