Oscar Cabrera

I just had a Magnaflow 12259 on a '21 5.3 single exhaust RST put in and it sounds awesome but I did not want anything annoying or crazy Loud. I drove to a shop 25 miles from me (MA) because of reviews I read online. Installer is very important in my opinion. Removed the stock muffler and added about 3 feed of stainless pipe towards flex pipe. Removed flapper, kept resonators but added a 4 inch od stainless steel tip. All welds and added pipe is SS. Shop did a great job and had me in and out in 45 mins. Sounds deep and clean without being gurgly or flappy. Really sounds like it should have sounded all along and yes throttle response is better, flapper is a real limiting factor in the way the stock mufflers exhaust.

Bored so figured I pop back in with an update, so got the truck back in may or so. All was cool for about 5k miles then little things here and there some surging and some lunging. Long story short, one cold evening I turned the car on and there was fairly loud ticking / clanking coming from engine bay, no CELs. Recorded it with my phone and went to the dealer, they replaced the right side lifters and a pushrod, got a rental from them all good. Going home noticed there was still some surging / lunging that was the original reason I had brought the truck in a month earlier but they could not duplicate. Fast forward a month and a new right side lifter bank turns out that I had a defective camshaft actuator magnet, when faulty it causes issues with the timing and causes shuddering which some might interpret as transmission or TC problems (which I did, given lifters had been all been replaced). Bulletin on that is 22-NA-080. Figured someone might find this last bit of info useful. No more shuddering issues, my dealer has been pretty top notch, have gotten a rental 2 out of 3 visits and always grab a coffee and snacks when I am there. Hopefully no more visits for a while.

sorry man - was at least your lifter issue fixed once you had that done? I guess you only put 1k miles since repair.

first new car that I have not leased. Will be buying and trading in a car i own. So yes, I have more questions than if I were going into a dealership and leasing a brand new car for 3 yrs. I have put a deposit down and it is being held while I get title of my car I bought off lease. that is why it is still there, also we are not talking about a 20k used car, this is a 50k car. Economy is also starting to turn and things are selling slower than a year ago. Not saying this matters in my case, just staring facts.

one more Q from me on this. once the repairs have been done (with the updated parts) are people still seeing these failures? anyone know?

thx bwoodsmn. I think i am just gonna run with it, will raise to my dealer so they know I am aware and that if something does go wrong I expect them to treat me with white gloves and if go to bat for me if sh&t realy hits the fan. The car is CPO and has a 100k mile powertrain warranty so it is covered. The unknown is hoping something don't happen while on VK or some long haul, that is the unknown. At least I know that all of the left bank parts were already replaced.

Yes I read it, I guess i figured that since it would be sold again it would be prior to sale. I get they are not gonna dig in there. I think at very least I can ask them to source me the service records of the repair, at least I can see what exactly was done. I like the truck a lot and kinda was sold before I stumbled onto this topic with the '21s --

I am actually feeling kinda positive about it. Just wanted to get a view from a broader group and people who know these trucks much better than I do. I have driven Toyota's and more recent volkswagens and reliability has been excellent. I know I am walking away from that but the funcitonality of a truck is much better for my needs now.

thanks for digging newdude. The car has the features I want. it is an RST all-star plus with the safety 1 package and is essentially new, also comes with the bed cover and side steps so I am inclined to go with it. The car is being sold at a dealership near me as a certified pre-owned so it comes with an extended powertrain warranty 6yrs/100k miles already. That would cover engine work i would think.... What would you guys do - certainly not a cheap car looking at 50k.

I am just wondering if I should just go ahead with it being that the failure has already happened and maybe I am at a lesser chance of the unknown, or just move on, knowing that someone has had they hands in there already and fiddled around with the internals.

I appreaciate the help I am just wondering how I should proceed, I am either very lucky, failure has happened already and dealt with in the proper manner, AND the car is CPO. or is this just the universe telling me, "car is a bust bro" move on.

K, Ya smarties - 3GCUYEED4MG240446

yes I have it

Truck I am looking at had a manufacture date of 02/2021 in door jam sticker so it was affected by the bad parts. Also, the service center confirmed that the lifter service had been done on both banks back in mid Dec.

Actually it was a chevy dealership - Al Serra in Michigan. Person I spoke to also said that they would be happy to share the repair history when I take ownership of the car.