I've gone the route if 10 ply tires on a half ton a few times and always missed the ride of the p metrics. I have 8 ply Duratracs on now and although it rides just ok I'm already looking forward to the next set being p metrics. I searched these Duratracs out because they were only 8 ply and the lightest aggressive tires in my size of 285/70/17's. You don't have nearly the sidewall I do. I sure wouldn't consider 10 ply.
Because of previous experiences of adding a louder muffler and the helicopter sound of the 4cyl. mode I wanted to have the flapper if needed. I pin mine open now so I can't imagine it's restriction is too large. I would have removed it if I knew it wouldn't be needed. Which it's not. I added the Magnaflow for the sound not really for the power gain which is small anyway. The 6.2 has plenty of power and I bumped up the throttle sensitivity so take offs are much more enjoyable.
Even with the flapper pinned open I don't get the helicopter noise. I can tell it's in v4 most of the time but it's not at all intrusive like it was with the MBRP cat-back. I can't imagine anyone being bothered by it.
I have the Magnaflow 12909 I believe. ( The one for the 6.2 liter) Just removed the stock muffler and welded this in it's place. Left the flapper valve in it. With the flapper operational it's hard to tell much of a difference from inside the truck. Pinned the valve open and it sounds much better. I left the resonator on because I was afraid it would be too loud. I then tried a MBRP cat-back and it sounded really good but ended up being a little too loud, especially when towing a heavier trailer. Went back to the Magnaflow. Had the girlfriend use the truck while I listened from the driveway and it sounds great. Deep, powerful sound but in no way loud. Sounds more like the 93-97 Camaro LT-1 with a nice rumble.
I had the rattle several times. Twice it was under the long dash insert.. Wires were rattling against the plastic cover just like the previous generation of trucks. Another stemmed from my LOC under the dash for my amp . This last rattle I had came out of nowhere and it was the 4 screws on the panel under the steering column. They had worked out about 1/4". If you sit in the truck and tap around with your fingers you may be able to narrow down were the rattle is. Sometimes you can think the noise is coming from one place but it ends up coming from something nearby.
I noticed when I had swapped out my stock blocks for 3" blocks I had the same feeling you did. Even when stopped and giving it gas to get over a hump I had going into the garage. I went back to stock and it lessoned quite a bit. Now again I'm wanting to lift the rear a little bit I'm thinking 2" blocks this time.
I should mention that I have the Max Tow package with the stiffer ride so when I say I don't recommend the Bilsteins take that into consideration. I didn't like them at all as I felt EVERY little seam in the pavement..I swear you could paint a line across the road and I could feel it when I drove over it. I'm much much happier with the poly spacer kit and stock " black" shocks.
I had this issue when I had my Bilstein leveling shocks on but it went away when I put the stock shocks back on the front. Sheet that I installed a soccer leveling kit but the noise is still gone. Could very well be the shocks but I'd get another opinion and wouldn't let the dealership do the work.. They want ridiculous rates..
Ditch the 20" wheels. Go for 17 or 18" stock wheels and stock size tire that's rated the same as it left the factory. I've found the Goodyear SR-A's to ride the best and if you don't off-road then they're not as bad as you hear about. I wouldn't do Bilsteins as they will definitely firm up the ride and you're going to feel every seam and tiny imperfection in the road. Stick with the black factory shocks.
Typically the Bilsteins will amplify the small jarring bumps and pavement cracks, seams, etc. It was really noticable in a video I shot with the Bilsteins and then again without. You could hear the truck hitting the little bumps with the Bilsteins and it smoothed out when I went back to the stock black shocks.
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