Boombastic

it is loud enough to let u know that there is a v8 under the hood...but not loud enough to annoy the neighbours or scare away the deer

I own a 2019 GMC Sierra AT4 with the 6.2l motor. I recently purchased the general motors performance power package Which consists of a cold air intake and a cat back exhaust. General motors claims 15 hp with this set up. Stock 0 to 60 mph.....5.8 seconds upgrades...........5.59 seconds stock 1/8 mile.....9.2 sec @76 mph upgrades....8.99 @ 78.8 mph stock 1/4 mile........14.15 @96.5 mph upgrades.......14.0 @99.0 mph

https://www.facebook.com/kevin.mossip/posts/10155135258426081 This is my 14 with 6.2l an MBRP CAT BACK AND AR headers. This was a cold start up. Way to loud on the highway. I now have a stock 2017. Dont think I will put headers n again.

Awesome job fellas. Post some vids please.

Can't post a pic. File is too big

As u can see....there is already moisture on it just from rain.

I have a new 2017 Denali I've noticed that without a gas cap there is potential to let dirt and water into the fuel system. I have seen water puddling up in around the filler hole as well as bit of dirt. Any thoughts on how to seal this up a bit better.

Yes it is faster form 0 to 60. I tested both ways. it changes shift point between 1-2 and 2-3 gears. 0 to 60 is a half second quicker when fully depressed. shift is 5300 rpm between 1 and2 as compared to fully depressed which is 5800 rpm. Shifts from 2-3 are also changed. I took some good vids of both scenarios.

Any handheld tuners for the 2017 GMC trucks that remove speed limiter?

As I have stated in another forum,that is quite impressive. I am a bit sarcastic and do not mean to be. But my 14 Denali 6.2 ran 14.7 stock in the 1/4 and after adding a supercharger and giving it about 100 rwhp extra it ran 13.5 to 13.7 in the1/4. And coincidentally I have speedometer acceleration videos of my stock 6.2 6 speed goin 0 to 100 mph in low 15 seconds and another vid a 2015 highcountry 6.2 with the 8 speed running 0 to 100 mph in the mid 15 second range. So maybe you were lucky to get a really fast one. Either way, very nice run.

I have the same setup on my 14 Denali and I just love it.

Mine ran 14.7 @ 95 mph stock. Then ran mid 13s @ 101 with a supercharger. Added a set of headers a was able the get 12.92@ 105 mph. It's a 6.2l with 3.42 gears.

Oh ok. I thought that it was one of the newer direct inject trucks. There aren't too many of us out here with the newer style trucks that are running the 12's. I realized after I posted that your truck was a 2009 after looking at your signature. Either way nice runs buddy.

That is sweet. Looks like I have been dethroned my best was a 12.92 @ 105mph in my 2014 6.2l crew cab Denali. Excellent job What was the cost for this setup? Is yours a 2014 also?

Any thoughts on the LUMENS XENON HID CONVERSION KIT for the Sierra Denali.trucks