6.6L L8T Gas Exhaust Options - MBRP, Borla...

powderMonkey · March 9, 2021

I was wanting the MBRP T304 system, so I called MBRP yesterday and got a recorded message that they are not taking calls, and to contact them via the website. I did that and got an instant response, but it was not at all what I wanted to hear:

ME: I am wanting to purchase T304 exhaust part number S5093304 for my 2021 2500HD. Are those in stock and available to ship? If not what is the lead time roughly? And would it be possible to swap out the chrome 4" ID 5" OD tip, for your black dual wall 4" ID 5" OD tip part T5053BLK? Thank you!

MBRP: Sorry, they are out of stock and it could be 6+ weeks at this point. Sorry, you cant swap tips.

Borla's own website says "coming soon" for our trucks, yet it is listed as an accessory on the official Chevy Accessory site. What is the deal with that? Has anyone successfully gotten a Borla direct from Chevy? If so what was the lead time on that?

Official Chevy Accessories Borla Cat-Back Link

Any info fellas? Or other options? Thanks!

TrailBoss1 · March 9, 2021

Yes I got the Borla from Chevy. It was at my dealer in 3 days- no shipping charges if sent to dealer. Sounds great with a tone between their touring and sport exhausts in my opinion.

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Simsy · March 10, 2021

10 hours ago, powderMonkey said:

I was wanting the MBRP T304 system, so I called MBRP yesterday and got a recorded message that they are not taking calls, and to contact them via the website. I did that and got an instant response, but it was not at all what I wanted to hear:

ME: I am wanting to purchase T304 exhaust part number S5093304 for my 2021 2500HD. Are those in stock and available to ship? If not what is the lead time roughly? And would it be possible to swap out the chrome 4" ID 5" OD tip, for your black dual wall 4" ID 5" OD tip part T5053BLK? Thank you!

MBRP: Sorry, they are out of stock and it could be 6+ weeks at this point. Sorry, you cant swap tips.

Borla's own website says "coming soon" for our trucks, yet it is listed as an accessory on the official Chevy Accessory site. What is the deal with that? Has anyone successfully gotten a Borla direct from Chevy? If so what was the lead time on that?

Official Chevy Accessories Borla Cat-Back Link

Any info fellas? Or other options? Thanks!

I bought the Borla exhaust through GM accessories in January. It shipped next day and had it 3 days after purchase.

powderMonkey · March 10, 2021

Thanks for the replies guys, sounds like the Borla is the way to go for sure and it's actually available.

CT Chevy Connoisseur · March 11, 2021

Borla direct has not released the Sport version yet. The Chevy one is a milder tone than the soon to be released sport version from Borla direct. I'm waiting as the GM version is far too tone for my taste.

L8T · March 17, 2021

Not sure why guys don’t just go to an exhaust shop and get them to just put in a muffler and maybe tune up the tail pipe. Cheaper and just as good. The stock exhaust is already 3.5” and they last longer than even T306 in my experience.

I bought a magnaflow, had it installed and also had them install a 60 degree bend behind the last hanger and add a tip so it exited out the side. $450 CDN sounds and works great.

Edited March 17, 2021 by L8T

powderMonkey · March 17, 2021

Hey L8T - that is not a bad idea at all, I hadn't considered it! Thanks for the input. That may be a thing I investigate with a couple of phone calls.

Did they weld your Magnaflow in, or use those big sealing band clamps?

Simsy · March 19, 2021

On 3/17/2021 at 10:40 AM, L8T said:

Not sure why guys don’t just go to an exhaust shop and get them to just put in a muffler and maybe tune up the tail pipe. Cheaper and just as good. The stock exhaust is already 3.5” and they last longer than even T306 in my experience.

I bought a magnaflow, had it installed and also had them install a 60 degree bend behind the last hanger and add a tip so it exited out the side. $450 CDN sounds and works great.

I bought the GM Borla system because it doesn’t void any warranty, It bolted on and used the factory hangers, there was no welding needed and came with its own million mile warranty. I’ve done the exhaust shop thing more times than I’d like to admit and it seems like it never lasts more than a couple years if you’re lucky.

Sierra Jon · March 21, 2021

Not sure why guys don’t just go to an exhaust shop and get them to just put in a muffler and maybe tune up the tail pipe. Cheaper and just as good. The stock exhaust is already 3.5” and they last longer than even T306 in my experience.

I bought a magnaflow, had it installed and also had them install a 60 degree bend behind the last hanger and add a tip so it exited out the side. $450 CDN sounds and works great.

I've done this with both my 5.3 and my 6.2 trucks... I'll be doing this on my 6.6 as well.

CT Chevy Connoisseur · March 23, 2021

The reason why you don't go muffler only is so you never have to do it again. Borla guarantee is for life. No changing out in the future, I did the muffler thing on my old one and frankly got tired of replacing every few years. Since I keep my trucks until they die I don't want to swap out exhausts like the last truck.

CT Chevy Connoisseur · March 23, 2021

Anybody have any videos with the sound of the Chevy Borla exhaust? Getting tired of waiting on the sport exhaust but don't want it too mellow. Can't find any examples on You Tube for the 6.6 factory one

Laidback · March 23, 2021

12 minutes ago, CT Chevy Connoisseur said:

Anybody have any videos with the sound of the Chevy Borla exhaust? Getting tired of waiting on the sport exhaust but don't want it too mellow. Can't find any examples on You Tube for the 6.6 factory one

i would like to hear this as well

Sierra Jon · March 23, 2021

The reason why you don't go muffler only is so you never have to do it again. Borla guarantee is for life. No changing out in the future, I did the muffler thing on my old one and frankly got tired of replacing every few years. Since I keep my trucks until they die I don't want to swap out exhausts like the last truck.

Just buy a stainless muffler... I've never had a muffler swap rust out. You can buy the same exact muffler that is incorporated in most of these full systems... You're just paying a fraction of the cost.

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Q-ball · March 24, 2021

On 3/9/2021 at 9:57 AM, powderMonkey said:

I was wanting the MBRP T304 system, so I called MBRP yesterday and got a recorded message that they are not taking calls, and to contact them via the website. I did that and got an instant response, but it was not at all what I wanted to hear:

ME: I am wanting to purchase T304 exhaust part number S5093304 for my 2021 2500HD. Are those in stock and available to ship? If not what is the lead time roughly? And would it be possible to swap out the chrome 4" ID 5" OD tip, for your black dual wall 4" ID 5" OD tip part T5053BLK? Thank you!

MBRP: Sorry, they are out of stock and it could be 6+ weeks at this point. Sorry, you cant swap tips.

Borla's own website says "coming soon" for our trucks, yet it is listed as an accessory on the official Chevy Accessory site. What is the deal with that? Has anyone successfully gotten a Borla direct from Chevy? If so what was the lead time on that?

Official Chevy Accessories Borla Cat-Back Link

Any info fellas? Or other options? Thanks!

I just ordered my aluminized steel MBRP over the weekend, all websites said 4 weeks out. Got a email yesterday saying it shipped and expected delivery is the 26th. Plus they had a promo going for 12%off. $385 to my door.

CT Chevy Connoisseur · March 25, 2021

20 hours ago, Q-ball said:

I just ordered my aluminized steel MBRP over the weekend, all websites said 4 weeks out. Got a email yesterday saying it shipped and expected delivery is the 26th. Plus they had a promo going for 12%off. $385 to my door.

Nice - won't go that route because I plan on only replacing once, aluminized steel will rust, but that's a good price