SSchup

Those are Ridge Grapplers not Trail Grapplers, big difference in road noise over the Trail Grapplers.

New Level was the cheapest when I bought mine. I ended up buying mine from Performance Lifts even though they were a tad more. I bought my 4" CST lift for my 2013 GMC from them and there customer service was always great. Decided to order my 4 1/2" for my 2018 from them from past experience.

I really don't see the big deal with just leveling to run a little larger tire. A 2" level kit will allow you to run a 33" tire. Depending on the tire if it is E rated, sure it will ride a little stiffer. Worst case scenario, you may need to go to an aftermarket control arm. You can buy a Readylift 2 1/4" level kit with uca's for under $500.00, and not worry about rubbing on the uca's. Still a hell of a lot cheaper then doing a full suspension lift. I'm sure many people are not interested in spending the additional money and cutting up a brand new truck to get an additional 2 1/2"- 3" of lift. I ran a 2 1/2" level on my 2018 for 6 months with a 33 1/2" E rated tire and it rode just fine. My truck is now lifted 4 1/2", but that was my original plan, just needed the time off from work to install the lift. Obviously it rides better with the lift, but that's because I spent additional money for full coilovers. So hardly a comparison to just leveling.

I'm interested in hearing any feedback from anyone who has that JL sub under the center console. I was looking at it myself but would like to hear from someone who has done it

They were, last was the 2013'S

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Why not look thru the leveling kit thread in this section.

Yeah maybe with a 305/50/20, since it is only a 32" tire.

You could probably get away with 20x10"s with a 285/55/20. Pretty sure you wont clear with a 33", I'm running a 4 1/2" lift with 20x10's and a 305/55/20 and I don't have a lot of room for much more. Spacers would just push the wheel out farther and create more offset, so no. The offset on the wider rims is what causes the clearance issues.

You should have no problem with a 33" tire on a 2" level with stock wheels. If your considering a 20x12 wheel you will need to do some pretty serious modifications to your front wheel openings to clear that kind of offset. Before the lift I was running a 20x9 0 offset and a 285/60/20 (33.5") tire and I had to trim and zip tie my liners back. That was with a 2 1/2" level.

I'll refer you to this link, It gives a better description of how it works and the install than I could give you. I ordered the Deaver and CST kit from PerformanceLifts . I went with the CST 4.5" coilovers also rather then using the CST spacer with the OEM struts. I did the Stage 1 kit and added the CST street series rear shocks. http://www.trucktrend.com/how-to/chassis-suspension/1705-lifting-a-2017-silverado-1500-z71-with-cst-and-deaver/

I just replaced chrome bumpers for painted on my 2018 LTZ because I preferred the look of the High Country front ends.

Summit Racing has tons of tips, just measure the inlet size you need and outlet size you want and put that in the search for exhaust tips.

Sorry I just saw this, been on vacation for the last ten days. To answer your question, Yes, I'm very happy with the CST kit. I ran there 4" kit on my 2013 Sierra and it was a great kit. The new kit for the K2's is a bracket kit to work with all three of the different uca's that GM used on these trucks. The install is a little more involved since you need to drop the steering rack 4.5" and install a steering extension with the new kit. I did the install myself with help from a friend, took about 14 hours taking our time. Main thing is follow the instructions closely. I went with the CST coilovers in place of using my stock struts and the 4.5" spacer. I wanted the best ride possible. I also decided to do a Deaver mini-pack in the rear in place of the included 3" block. I just got home from a Florida trip, drove the truck from Michigan to our place there, 2200 mile round trip. I got to say it was a very pleasant ride. I can honestly say the ride is an improvement over the stock ride. It just soaks up the hard jolts over bridge abutments and feels much more planted then the floaty stock ride. I also decided to go with the Nitto Ridge Grappler in 305/55/20 C range tire, 52 Lbs. over the 10 ply same size version at 64 Lbs. to get a better ride. You should expect to pay $800.00 - $1000.00 for a shop to install it. Any other questions I'll be glad to answer.