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Hello Everyone! Before I get started I want to thank anyone in advanced who responds with pertinent information.
I'm looking for a replacement exhaust system for my 09 Silverado 6.2L 4x4 Crew Cab/Short Bed. My current system has lots of rust (living in MD, they heavily salt & brine the roads here) and has sprung an exhaust leak right behind the muffler on one of the pipes.
I've been searching around (thought it would be easy to find a system) but have not had luck in finding what I have been searching for. There are plenty of systems for 5.3L & 6.0L motors but scant any for 6.2L.
On my truck currently is an aftermarket cat back system that was there when I bought the truck (not sure which brand.) It is a single in / dual out muffler with dual pipes going out the bumper.
What is the factory flange diameter at the end of the factory Y pipe? I'm seeing conflicting information (this will help me determine what muffler to buy if I piece meal a system together)
If you have any suggested systems, here's what I'm looking for
Material: 304L Stainless Steel
Configuration: Dual exit at rear bumper
I'd consider a long tube header setup w/ high flow cats as well (I would like to maintain all emissions equipment) any suggestions there are also welcome.
I can always get a quote from a shop but I wanted to shop around first before I did that.
I've had this issue for two months but it has been minimal until recently. While going anywhere above 30mph, at around 1200rpm if I give it about quarter throttle to half throttle i will hear a clanking/knocking noise. I have recorded it with my phone but you are unable to hear it at all. The other day while merging on the highway it made the noise much worse than it ever has. I am wondering if anyone has had this before, I know some of the 3.0 DuraMax guys have had it, but has anyone with the 6.2 had an issue similar to this. I will be taking it to the dealership tomorrow.
By Steve Polzien
Hey everyone, I recently purchased a 2017 GMC Sierra 1500. It’s a 4x4 Denali with the 6.2L and ultimate package. Overall it’s everything I’ve ever wanted in a truck and more.
I live and work in South Carolina, but I’m originally from Upper Michigan (Yooper, eh). Husband to an amazing wife and father to two busy boys.
I joined the forum to get some insight into maintaining my truck as well as some tips for upgrading smaller items.
So I've tuned my truck with and it has made a difference from what I can tell. A couple of questions, however.
1. Is there any way to truly fix the hard downshift from 3-2 and what I call lagging going from 2-3 under acceleration? I installed the 91 octane tune, disabled AFM, speed limiter and changed the shift points from 2-3. It seems like the shift point pressure is too much. The RPM's spike when i'm easy on the throttle after a stop.
2. There is an option to change the axle ratio via the tuner which I thought was impossible because the axle is ratio is mechanically fixed, yes? I think I have the 3.23 but I am not 100% sure
3. Side note, I have an Air Raid intake tube, k&n filter, installed a catch can and did a muffler delete. I took out the flapper valve out as well. Truck runs and performs better (sounds awesome too). When I go to pass cars on the highway, I can easily break 100 and you can tell the engine still has a lot left. I truly believe that this truck's engine life has been extended greatly after disabling AFM. Thanks guys.
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