CorvetteOJ

OK, it finally happened to me. I have Denali, 6.2, 3.42, crew cab, 6 ft bed, with 4600miles. I took delivery on Nov.7. The first time I noticed the vibration was about two months ago, when I had three other guys in the truck with me on a golf outing. I never noticed it again because I was always alone in the truck. Yesterday, my wife and mother-in-law were riding with me on a 300 mile trip. The truck vibrated consistently from 68 to78 mph. Over 80 it was pretty smooth. I have read most of this thread and still remain confused. By the way, I do have the factory chrome 22" wheels (SEY) and Bridgestone duelers. I dread going through the entire process of tire balancing, drive shaft balancing, etc.. I am convinced that tire balancing is not going to fix this vibration. The other thing is, I have never noticed it when I am alone in the truck. So I guess I am now a new member of a very unfortunate club!!!

Rick, I will tell you, it was a real pain in the butt to wrap. It took my Xpel guy and me about two hours to get it done. First let me say, no I do not think it is going to be very durable, and he didn't even charge me labor for it because he didn't think it would last. First, the vinyl isn't much thicker than saran wrap so that made it much more difficult to install. It is made by Avery, which he said was one of the best products on the market. He had to use a heat gun to convince it to stick to the two grooves, at the top and bottom. We just wrapped the edges around to the back. He did put separate pieces of each end to make it look better. If it had gone on better, I would have had him to possibly cover it in Xpel also, That certainly would have made it more durable. I have enough of the film left to give it another shot when he gets time to play with it. Right now, it still looks great, but I haven't driven it except a few short errand runs here in town. I will post up if it becomes a total flop, or if we improve it to the point where I could whole heartedly recommend it. Thanks for asking, however, for now, it is still an experiment in progress.

No David, but thanks for noticing. It is simply a vinyl design my graphics guys installed to match the black and white checkered vinyl stripe at the top of the windshield.

Yes David, you can take every word I have put in this thread as "straight shootin, honest to goodness fact." I have never been any more impressed with a tune. The fact that he street tunes the trucks doesn't take anything away from the results. i would do it again in a micro-second! Good luck with yours. OJ

No Brent, the valve has no affect on V4 drone. I eliminated my entire system from the 3rd cat back, 24 hours after taking delivery. I installed the 22" magnaflow, single in and dual out and drove it for almost two months with the V4/V8 mode working. I had absolutely no drone. Now, with the tune, and the AFM turnined off, I still have no drone. It was perfect with AFM and is perfect without AFM, the flapper being eliminated, had absolutely no impact. I eliminated mine based ont he advice of my performance exhaust guy. He said he cuts out an average of three a week on late model Camaro's and other GM vehicles due to the "flapping nioise" they tend to make after a few months of use.

I'm surpirised I haven't posted to this thread before now. As I was perusing it just now, I noticed Mike's post and made me think of my experience with a vinyl cover. I had a Vanish Access on my last Silverado, paid $400 for it, had it about 30 days and sold it for $100. It drove me crazy when I would look in the rear view mirror while driving, the vinyl was flapping up and down...yes it was adjusted properly and then some. I ordered a painted to match Undercover SE Lux for the Silverado and it was great. As a matter of fact, I liked it so well, when I ordered my Denali. I ordered another painted to match Undercover for the Denali. I had it two weeks before I got the truck. It is a very secure cover and one of the most waterproof on the market. However, I guess it isn't real popular with most of you guys because you can't spontaneously decide to haul something large if you are away from home, because you pretty much have to remove the cover. Although it can be removed and reinstalled in less than five minutes, storing it becomes an issue, if not at home. It works great for me as I don't like to haul anything anyway. I don't believe I saw anyone else post in this thread concerning a painted to match Undercover, so I guess that leaves me in the minority, but that's OK, that's not the first time, and I'm sure it won't be the last. I'm very happy with my Undercover. I can't think of another one that would work as good for me, except maybe the Retrax One. My son has that on his Raptor, and it looks good.

Congratualtions Tom. Personally, I think you will be happy, and probably surprised at the results. Let me know if you have any questions about the install. As TJay told me, getting the coupler to slide on the throttle body is a little snug, but it will go. Other than that, the rest is a piece of cake if you follow the directions. Good luck.

I'm sorry, can't post a clip due to my being technically challenged. Yes, they will reset it any time you want. As for the difference between the 18 & 22" magnaflow, I can't say, I have the 22" but have wondered if I made the right decision. Mine is pretty nice but my exhaust guy tells me the18 would give me more rumble. Good luck with your decision.

The CAI I'm running is the Airaid designed for the 5.3. One of the other guys on here, TJay, did it first and then I followed his lead. The system works unbelieveably well, looks great, fits like a glove. Airaid says they don't plan to build a specific model for the 6.2 since this one serves the same purpose. It also has a huge snorkel coming out of the bottom of the air box that hangs down behind the grill, and man does it suck some air. It is definitely the best CAI system I have ever owned, and I have had 15 or 20 or them in the last 30 years. You are right, you can't find anything specifically marketed for the 6.2 yet. As for the exhaust system. Mine is a custom cat back installed by a performance exhaust shop here in town. (Montgomery, Alabama). We simply cut the factory system off just behind the third cat and through it away. Then installed a 22" Magnaflow, single in, dual out, and fabricated two pipes to come straight out the back. The last 22" of the pipes are 4" chrome. Hope this helps. For what it's worth, I wouldn't change a thing on either system. They both far exceeded my expectations. Good luck with yours.

Thanks, it was a great trip and well worth it. The ballpark cost is $200 to 250. They don't dyno trucks because of the danger of the drive shaft coming apart and messing up the truck and/or his dyno. He does have a super nice dyno. They only street tune trucks and they do a lot of late model GM trucks. They have street tuned an '06 Hummer H3 and an '11 Silverado 5.3 with a 3.08, for me, during the last five years. Everyone of them have been unbelievable results, especially the Hummer.

I have received numerous PMs asking about my tune, so many in different threads, I don't believe I could find them all, so I thought I would just initiate a seperate thread to address it. This may be a long post because there are several details worthy of mention...the tune, mpg, the ride, bumper chips. First, PCM of NC, in Mooresville, NC, are genuine professionals who focus on GM products. Tuning is just a side aspect of their business. Their claim to fame is custom building GM cars to customers desires. Too much detail for this thread, but I saw 6 Camaros with everything from exhaust and intake to complete custom "hotrod" with supercharger. Lots of head and cam jobs on late model Camaros. The oldest one was a 2010. They have their stuff together and very, very, customer oriented! My tune far exceeded my expectations, even though this was my third experience with them. For those who haven't seen my previous posts, I live in Montgomery, Alabama, 6 hours, plus, drive to Mooresville, however, the results were worth every mile. The most noticeable is in the low end, great throttle response, he adjusted cam timing, shift points and pressure, very smooth shifts, Deleted AFM, and it just keeps digging as long as you keep your foot in it. I thought the 6.2 ran pretty good from the factory, until Alvin Anderson, the owner, worked his magic. I know some of you could actually explain the tune better than I , and I was there. All I know, by the seat of the pants, my truck is now 100% better in driveablility and fun than the truck I took up there. By the way, they use HP Tuning software. They have a commercial license with them for unlimited use. They can do everything for the 2014s, including of course, the 6.2, my engine. I know some others don't have the software yet to tune the TCM. I can honestly tell you the Airaid system I installed before I left, definitely overrides the sound of my custom dual magnaflow catback sytem when you get your foot in it. With the tune, it is much more noticeable, man does it suck some air with that huge snorkel coming down from the air box behind the grill. I don't know what else to say about the tune specifically, other than it's like a freaking miracle!!! One note about MPG. I went up on MLK day and the traffic was ridiculous. I never exceeded 75 the entire trip and a lot of it was under 70. As a result, I had one segment of 22.4 MPG with an overall average of 20.6 MPG for the trip up. On the return trip, there was a lot less traffic, so I played with it a lot, trying to break in my tune and ran 80 to 85 most of the way. When I got home the computer said I averaged 19.7 for the trip home, however, I did the math the old fashioned way, total miles vs. gals and came up with 17.8. In my book, that is fantastic gas mileage for the way I was driving home. Alvin said it should improve some, and I think it did, considering the way I was driving on the return trip. One last point of interest, stone chipped bumpers. First, know, I am very OCD about staying away from vehicles in front and when passing semis, I do it at excess speeds to expedite the maneuver. I got four stone chips on the front bumper, however, when the stone hit, the paint flaked all around the tiny spot where it actually hit. The paint was actually loose, you could peel little pieces off with your fingernail. I did get a normal stone chip on the hood, no paint flaking there. MY dealer's body shop is doing the three step process to attempt to touch it up and get it smoothed out enough to put the Clear Bra on it. They would repaint the entire bumper if I wanted it, but I prefer to try this first. I had tried before I left to find a clear bra installer, and could not find anyone around here who did it. The body shop manager is going to call this guy who does it and he will come down (115 miles) and do mine. He said this guy is the best in the state, but he's pricey. It's going to cost about $1000, but I cannot go through this every time I take a road trip. The body shop manager said he never seen anything like what happened to my bumper. He said, It was as if it were painted a second time in the plant. I know it was a very revolting development. I have had a lot of stone chips, but I never seen paint do that before. OH by the way, my 22" wheels rode like a limosine the entire trip. In my opinion, 18" could not have rode any better. That's my story, and I hope it answers most questions that were asked of me. Let me add, if anyone is interested in an in-person tune and feel like you are within driving distance of Mooresville, NC, give them a call. PM me for the contact info. There's nothing in it for me, I'm just a very happy customer trying to share some great info with my GM Truck community. Have a great weekend everyone!

I agree with Russell. The Airaid does sound great, and I guarantee, you can feel it in the seat of the pants. How many more HP, I have no clue, but it feels like a lot! Yes, when you put your foot in it, the intake does overpower the sound of the exhaust. I also have the 22" Magnaflow catback duals. That huge snorkel on the Airaid is underestimated in reference to the amount of air it can suck in. I still give TJay full credit for talking me into it, or should I say, for taking the time to answer my numerous questions about it, over and over. I forgot to mention, the reason I had so many questions was due to the fact we were putting a system designed for the 5.3 on our 6.2. He said it would work and install easily. Man was he ever so right. Best kept secret in town, especially for 6.2 owners, because out options are pretty limited right now.

You're right Bryan, at least I am hoping it is more enjoyable to drive home. I'll let you know how it goes. Thanks for your comment.

Yes, there is always a small chance of the inevitable happening. I guess I have always been pretty lucky in that respect. I did numerous mods to my Vette and never had an issue. I never keep any vehicle after warranty has expired. I have kept my Vette (03) because I have too much invested in it. I have never had a warranty issue where my mods or accessories came into question. It's safe to say my last 25 or 30 vehicles have been modded to some degree. I just hope the luck continues. I would never consider driving it for four years without mods and tune.

I'm taking my 6.2 Denali to Charlotte tomorow for a Performance Tune. I have an appointment @ 9:30am on Tuesday. Although they are 6 hours away, I have had good luck with them in the past. They tuned a Hummer H3, with an I5, and it ran like a V8 afterwards. They also tuned my 5.3 Silverado I sold to get this Denali. I can't wait to see what they can do with the 6.2. They are actually in Mooresville, about two miles from Dale Earnhardt, Inc. The shop is PCM for Less. They do use HP Performance software, which is one of the few available for the new 6.2. I have installed the Airaid CAI, and the 22" Magnaflow cat back duals. When they finish, it should run pretty good. I will be driving back to Montgomery immediately afterwards, so I will have about 6 hours of Interstate driving to find out. I'll post my thoughts on it, in this thread, when I return. In an effort to pre-empt some typical questions: Yes, this is a one & done tune. When I drive out, all I have is what is on the truck. Should the dealership ever have to reflash it, i would have to go back to Charlotte to get it redone, which they would do for no charge, however, there is of course, the 6 hour one way drive involved. I do have a great rapport with my dealership service department, so I don't anticipate any problems. They would never reflash anything without discussing it with me first. As a matter of fact, on Friday, they worked to ensure there were no outstanding TSBs or recalls on my VIN that might involve reflashiing of the ECM. If there were anything open they were going to take care of it immediately, so I would have a clean "bill of health" for the tune. They told me I was good to go! As I mentioned on a few previous threads, I do use my local Chevy dealer for service because I have no rapport with the GMC service department where I bought the truck. I have no access to the shop or technicians. At the Chevy dealer, I have open access and have gotten to know most of the technicians by first name. Yes, there is some risk involved here, but as they say, no risk, no reward, so based on my past experience with the tuner and my service department, in my case, the reward outweighs the risk. In the worst case scenario, it's just another road trip to Charlotte.