moconnor72

Good points on here. I have a 16’ GMC denali ultimate with the 5.3. I bought my truck new with 2,000 miles on it. It had a weird idle within a week so I figured it was something I was doing wrong. Nope. Fast forward to 2021 and I have put pirelli all seasons tires on, RXP catch can with a clean side separator, factory cat back Borla exhaust. The 2 biggest gains in throttle response were the 1. Borla and immediate. 2. Catch can- no more rough idle but a lot of gunk to be cleaned out periodically. Intake stays clean for the most part. I did buy a ARaid air Filter and elbow and took it off and tossed it somewhere in the garage. The COI are ok at mid range and with premium gas and a tune. The GM is a decent setup and they do tune it as a part of the package. I’d say the COI and exhaust with a tune won’t hurt anything. These V8 do suck in a lot of air.

I added the Borla cat back exhaust from GM and I noticed an immediate Increase off the line throttle response. I personally wouldn’t venture too far from borla.