NemesisC5

Looking for the Touring muffler as well for my 2023 TB w/ 6.2L. I can’t see scrapping the entire exhaust system and purchasing Borla Touring exhaust only to gain a better sounding muffler. I like the True Dual systems, however the S-Type is just a little too loud at startup for my neighbors at 5 am.

Good looking (from what I can see in the pictures) for those that like clean oem lines and fitment. Just purchased 23 TB black/black loaded 6.2 with 20” wheels. Definitely need wider tires and I’d like to add these or similar flares to give a more rugged look.

GM accessories/parts exhausts specify Borla for most systems, however they offer another exhaust that doesn’t state the brand, that one is made for GM by Corsa. It is similar to Corsa touring, possibly even quieter, however a little more more growl than oem. I had this dealer installed at delivery on my 2017 6.2 for $1195, all top quality components. I purchased a 2023 LT Trail Boss 6.2 yesterday and see basically the same exhaust however with more piping mimicking oem to connect to twin oem HDMI tips. I can’t recall exactly but it lists for over $2k. These are made for GM by Corsa without the Corsa designation but people familiar with Corsa will recognize the components and quality.

Mine came on Friday along with po50D. Monday after that my AC quit cooling, found leak in condenser coil...wth is up with GM? May be time to look into another brand truck.

I think most know of Kinney’s Muffler Shop in Texas however if not check out the link below. In my opinion they set the bar for custom exhaust systems with many videos to see and hear different combinations on a wide range of vehicles. If I remember click the ”videos” link on home page and it brings you to their YouTube channel. http://www.kinneysmufflershop.com/kinneysmufflershop.com/HOME.html

Every time I accelerate I'm happy I chose to stay with 6.2. I had a 2009 5.3, 2011 6.2 and now 2017 6.2. While my truck was in shop for TSB (tranny triple flush and new fluid) the GM loaned me his 2019 5.3 and I noticed it was less responsive from a stop but seemed to build revs more quickly once above ~2500 rpm. However, once I picked up my truck the difference in low speed torque was very much in favor of my 6.2. I have a heavy right foot and enjoy the feel of acceleration so the extra cost for premium 93 and higher cost of the 6.2 are choices I'm happy with. Just crossing 36k miles now and the motor "feels" like it is more responsive now than when new off the lot. A 2020 with 6.2 and A10 has been on my mind but sitting tight to see if/when a model with larger motor or supercharged 6.2 will become available. I don't do any towing so that has not factored into my assessment.

2017 Midnight LTZ Z71 6.2 did the first triple flush and shudder never went away. Did a second triple flush and shudder returned after 3k miles. Earlier this year dealer flushed and filled with the new fluid along with re-learn on TCM. So far shudder is gone and shift performance is more responsive, feels like a new TCM tune. Service manager said I may experience rough shifts during re-learn (which I have not) but put 2k miles on and if shudder returns they will replace converter. Thus far after 1k miles all is well.

I ran across the GM HP filter in the My Chevrolet (Onstar app) and posted as a "new find". The description says it has 5 fewer pleats and lists it flow rate. Indeed very expensive at $125 MSRP, for reference the AC Delco High Capacity air filter #A1518C is listed at $75.xx on Rock Auto which is very expensive as well IMO. It seems GM trusts the pleated paper filters to keep out dirt and optimized the design for increased flow while maintaining filtration efficiency/capacity. I ended up purchasing the AFE 31-10004 for just over $43 which seemed to be a balanced choice based on what I read in link below. The article was from 2009 so I'm sure there's something better now however didn't want to spend too much time splitting hairs on a drop-in replacement. https://www.nicoclub.com/archives/kn-vs-oem-filter.html

GM 84520923 Upgrade the performance of your vehicle with this Chevrolet Performance Replacement Air Filter. Rigorously tested for durability, long-term efficiency, and seamless integration, the filter has been tested to reduce airflow restriction by up to 10% at 330-g/s, providing increased performance both on and off road. Built with a performance appearance, this drop-in replacement filter contains 5 less filter pleats, which allows for an increase in airflow performance, and boasts a filter efficiency of 99.5% when tested to ISO5011. This filter requires no additional calibration and does not void the New Vehicle Limited Warranty. https://accessories.chevrolet.com/product/performance/performance-air-filter-84520923?year=2017&make=Chevrolet&model=Silverado 1500&categoryId=12009

I saw this GM 'high flow' drop-in replacement filter element today. Expensive. https://accessories.chevrolet.com/product/performance-air-filter-84520923?year=2015&make=Chevrolet&model=Silverado 1500 Description Upgrade the performance of your vehicle with this Chevrolet Performance Replacement Air Filter. Rigorously tested for durability, long-term efficiency, and seamless integration, the filter has been tested to reduce airflow restriction by up to 10% at 330-g/s, providing increased performance both on and off road. Built with a performance appearance, this drop-in replacement filter contains 5 less filter pleats, which allows for an increase in airflow performance, and boasts a filter efficiency of 99.5% when tested to ISO5011. This filter requires no additional calibration and does not void the New Vehicle Limited Warranty.

Has anyone performed autopsy of oem air intake tract? It contains some sort of baffling technology to eliminate noise and I was curious as to the air path and amount of restriction. This piece

I see differences in the tests now that likely explain results. The original test was completed with Airaid Jr Kit, including tube and oiled filter. The most recent test was done with MIT "tube only". This would imply recent test showed zero gains because the gains likely were from oiled high flow filter, similar to claims by K&N and other filter manufacturers. This seems to be backed up by jimmyboy8301 findings on Airaid website (with associated dyno chart) showing gains of 6hp gain utilizing more recent synthetic "dry filter". In summary, if part number and picture are correct on BPP website they tested MIT tube only this time where original test consisted of Airaid Jr Kit with tube and high flow filter.....not exactly apples to apples. As pointed out by Crobinson16 the MIT has been redesigned however the change appears minimal and nothing likely to yield gains. The 6hp gain likely achieved by high flow dry filter, in line with claims from other manufacturers regarding their high flow drop in filters. I noticed the S&B CAI was not tested (disqualified) due to removal of factory component which I assume is the metal mounting bracket the air box assembly rests on. The S&B looks to have the largest sealed box with large round filter.

Posted to ask BBP why GMT 900 platform with a 5.3L V8 using Airaid Jr. Kit with MIT and Filter only show to be the top performer according to their dyno results, however the next Gen 6.2L V8 showed zero gains with MIT tube only? The airbox appears to be the same or very close, does the 6.2L V8 not produce improved numbers because lack of the air filter only or was the factory air box modified in original tests with 5.3L V8? If so it seems modding the air box along with better flowing filter in my 2017 6.2L V8 should produce gains somewhere in line with complete systems in 2016 (latest) CAI comparison. Again, in 2016 CAI results the MIT tube only showed little to no gain so it appears 95%+ of gains are from improved air boxes and low restriction filters. Unless BPP has data of others factors to consider regarding their 2016 results it would make sense that either one of the air box/filter combinations from the tests or modified oem air box with high flowing drop in filter would be obvious choice providing the best value. Compare results from the attachment in my post you quoted with results from original test to results from 2016 testing in link below and you'll see why I'm asking. I don't like the extra noise from the aftermarket tubes and although they clean up appearance of engine bay I rarely open my hood so that is not high on of my list of priorities. Power gains, lower noise and best value are my primary interests. http://blackbearperformance.com/IntakeTestResults_2016.asp

See attached file with previous BBP CAI test using 2008 Silverado 5.3L Flex Fuel "0" engine Intake Testing Results - Intake Testing Results.pdf

In the latest BBP CAI test the MIT with factory air box showed no gain above factory numbers, however all other CAI's showed gains. Has BBP ever tested oem intake piping with baffles connected to aftermarket "CAI filter box" with larger surface area (reduced restriction) round/cone filters? I'm considering this with one of the "CAI filter boxes" tested by BBP. I recall in the previous BBP test with GEN 4 engines the MIT tube combined with factory air box and K&N replacement filter ranked high in results compared to other manufacturers complete CAI systems. Your current test utilized MIT tube with factory box and factory filter implying (to me at least) that a less restrictive filter element has the more effect than the tube itself. Please help me understand as I'd gladly purchase a complete system and install CAI box without tube if I could benefit performance without the additional sound the tube seems to create.

When I purchased my 2017 GM listed a larger front big brake setup in the GM Accessories catalog but they were not available yet. I was tempted later to purchase them but it was front only and not equal in quality to Wilwood product - Wilwoods are the icing on the cake, very nice touch. My compliments on your build.

Yep that's me on CF. I have plans to modify exhaust pre-catback just not settled on which way I'm going, catted or no cats with CMR Diablo tune cats turned off. I frequent a few forums gathering intel, the hot topic going is GM's new 4.2L DOHC TT Caddy motor likely a precursor of what we'll see in GM's top performing cars and in time our trucks as well.

Blaspheme indeed, I'll need counseling the day I hear a V8 running on 1 cylinder....

The cat back on the All Terrain made by TMG aka Corsa is the same I purchased through GMPP. I considered the AFE Y-pipe but was concerned it would likely throw codes and for $700+ I was not ready to take a chance that I'd have to purchase a tune as well voiding warranty. Post a sound clip if you don'y mind.

Mine will soon be banished as well. I've read the 2019's may have single cylinder mode...I bet that sounds good.

I have the GMPP Corsa 3.5" on my 2017 w/6.2, has a throaty sound when accelerating that I like to hear. At lower speeds around town it does have a little drone in 4 cylinder mode however I usually have my foot in it so it rarely sees 4 cyl mode.

Thanks Silver Sled

When I removed the MIT from 2011 6.2 before trade-in it became quieter and I liked it. I have not since installed on 2017 6.2 because I didn't want that low frequency sound again. Thanks for the feedback.

Did you notice an increase in low frequency noise after installing the tube with no other changes?

Reduction of backpressure downstream will not have negative effect on torque.