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Old 05-26-2023, 06:19 PM   #1
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2017 Basecamp
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Rock Tamers 2021 GMC Sierra 1500 dual exhaust

Hi, I'm in the process of purchasing a 2017 Basecamp. Looking at getting Rock Tamers, but unsure how they would do with the dual exhaust on the 2021 GMC Sierra 1500. It is the 3.0 Diesel engine. Anyone have the same setup? Would you recommend the heat shields? Thank you!
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Old 05-26-2023, 06:30 PM   #2
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I don't have duals, but I did weld a side exit for our TowTectors.

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Old 05-30-2023, 06:43 AM   #3
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Consider getting some chrome "turn down" tips to direct the exhaust towards the ground.
https://www.summitracing.com/search/...round-turndown
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Old 05-30-2023, 07:53 AM   #4
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You will definitely need heat shields as the exhaust will burn the flaps during regen.
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Old 07-03-2023, 12:12 PM   #5
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There are Rock Tamers with exhaust ports. This one is for a Ram.

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Old 07-03-2023, 12:37 PM   #6
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I am currently going through this exercise with exhaust replacement on my 2015 silverado 6.2l maxtow. Baffle let go inside the muffler and rattles at idle and in 4 cylinder mode. My truck originally had a 3.5"side exit. I wanted a Borla system, but their "touring" model (quietest) only comes in dual rear exit. For a number of reasons, (rock tamers for one) I don't want that. I settled on their "S-type" (middle noise level) dual side exit. Guess I'll sound somewhat like the cool kids.

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Old 07-05-2023, 01:16 PM   #7
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The thing of beauty showed up off the big brown truck today. It's 91* and humid today. Think I'll just look at it for awhile. Click image for larger version

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Old 07-11-2023, 06:05 AM   #8
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Originally Posted by dznf0g View Post
The thing of beauty showed up off the big brown truck today. It's 91* and humid today. Think I'll just look at it for awhile. Attachment 433920

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Nothing like a little sweet sounding rumble from a V-8 - Not too quiet and not over the top, just enough to know it a V-8
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Old 07-11-2023, 06:21 AM   #9
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Nothing like a little sweet sounding rumble from a V-8 - Not too quiet and not over the top, just enough to know it a V-8
It sounds great! Installed last week and took on a short hop AS trip. It's a bit louder towing than this old boy racer would like while pulling a grade in the 2500 to 3000 rpm range, and upon cold startup. No drone at any rpm and super high quality materials and build. Lighter than oem by my swag by 30 pounds or so. So, available payload increase as a bonus.
My son commented it sounds like a '69 Camero.
I would like to have had the touring model over the SS, but not available with side exit for my truck.

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Old 07-11-2023, 06:29 AM   #10
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So, just as an initial performance report, the exhaust seems to allow for more time in 8th gear and more 4 cylinder mode on flats, so back pressure must be less. But that doesn't necessarily mean higher mileage, especially while towing. I didn't note an increase on this shorter trip. We leave for an out west trip on Saturday, and that roughly 3k trip should be a better indicator. I don't expect more than a few tenths, at best.

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