Weiser699

Thanks Tyler. Yes, my plan is to do either 1.75-2" max in the front with those Bilsteins as I will be doing a 1" block in the rear. I still want to maintain about a 3/4-1" rake so once I have my Bilstein monotubes and 1" block in the rear installed will determine how much front lift I'll need. If the UCA's on these SLT's are the same as the AT4s, then I think I'll be safe with 2". I don't plan on off-roading much at all, mostly highway travel and occasional towing.

I have to run 93. 91 straight or ethanol blend still gives me bad knocking and for some reason my knock sensor doesn't seem to adjust. My problem is I only have 1 gas station that offers 93 in a 20 mile radius of where I live and I have to bring a bottle of Lucas octane booster with me when I travel when I can't find 93.

GM won't install a factory 2" lift because I have the max tow package (NHT code) plus it still has the crappy Rancho's so I am just going to do Bilstein coilovers in the front and bilstein rear shocks with a 1" block instead.

So AT4's use the exact same UCA as a regular SLT/SLE, etc? Same part#? I am going to get no additional wear and tear on my UCA's if I stay 2" or less? I hear horror stories of owners of the new model GM's/Chevy's destroying a UCA even with a 2.5" level and that the OEM UCA's are basically junk. Most manufacturers of level's recommend new UCA's because of this every reason. I just can't imagine why aftermarket UCA's are so significantly "beefier" than stock that any tire size over OEM requires a spacer or different wheels.

But you probably have stock UCA's, right?

I need concrete facts as there is so many conflicting answers, data, etc. I have a 2020 Sierra SLT with stock 20" wheels and OEM 275/60R20's (33's). I want to level the front 2", continue to use the stock 20" wheels but upgrade the tires to 285/60R20's and replace the UCA's with aftermarket ones and not have to use wheel spacers or do any trimming or cutting. Cognito says I need spacers. Zone says I need 1.5" spacers. Really? 1.5"? This makes no sense as even my OEM tires wouldn't even work then. BDS says it "should" fit. Am I stuck with having to use 275/60R20's? Will aftermarket UCA's even work with my stock wheels regardless of tire size? Anyone running my same setup with aftermarket UCA's?

My only fear is the sound level. I don’t want it really loud, just loud enough to notice a good exhaust. I’m afraid it’s going to be too loud and I’ll end up putting my muffler back on. I don’t know anyone in person to find out how loud it really is. Videos help but...

Thanks, going in Friday to do a muffler delete and leaving in both flappers and resonators. I have heard of others using muffler tape on the resonator screens. How does that change the sound? Does it make it deeper, louder?

I recently purchased a 2020 SLT 1500 with the 6.2. I need advice on a muffler that will give me a deep throaty tone and provide a 30-50% increase in sound but I do not want the "helicopter" sound when DFM kicks in and also I am ok with low drone in the cab. Would a Flowmaster Super 40 Delta Flow fit this bill? I am only looking at a simple muffler replacement. Not looking at replacing the entire exhaust with a catback or other upgrades. Resonators would stay in place.

I bought a 2020 Sierra with the 6.2. I’ve noticed when running top tier 91 octane premium ethanol free my engine knocks bad at low rpm in high gear. When I add Lucas Octane booster, the knock goes away. I don’t have 93 where I live. Why would I have bad knocking on 91? What can I do about this without having to add octane booster?