Jump to content

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

powderMonkey
 Share

Recommended Posts

powderMonkey Enthusiast

powderMonkey

Posted
  • Author
Posted

Time warp!  I finally spotted the MBRP T304 in stock at Summit Racing, and drove up and got it from their Cleveland store, and also the matte black tip.  I just installed it on the 4-post lift at the shop yesterday.  I only drove the 5 miles home last night because I was exhausted (no pun intended) but it does sound good!  Not too loud in the cab but you know it's there. I am headed back to the shop now to do a couple other things (we are closed today), and I'm going to get some pics and videos, and will reply back to this soon with some info and what I learned from the install.

  • Like 2
  • Replies 57
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Epsilon Plus
Epsilon Plus

Put the Vibrant on.   Did the trick. Pretty much stock silent inside at very low throttle cruise. No blaring drone through the range, just mellow exhaust tone now. You can hear it has a muff

TrailBoss1
TrailBoss1

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. Sent from my iP

L8T
L8T

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 long

Posted Images

sheath Enthusiast

sheath

Posted
Posted
4 hours ago, powderMonkey said:

Time warp!  I finally spotted the MBRP T304 in stock at Summit Racing, and drove up and got it from their Cleveland store, and also the matte black tip.  I just installed it on the 4-post lift at the shop yesterday.  I only drove the 5 miles home last night because I was exhausted (no pun intended) but it does sound good!  Not too loud in the cab but you know it's there. I am headed back to the shop now to do a couple other things (we are closed today), and I'm going to get some pics and videos, and will reply back to this soon with some info and what I learned from the install.

 

looking forward to this! :thumbs:

sweatandsteel Enthusiast

sweatandsteel

Posted
Posted

For those interested, I just got an email from Magnaflow that their street series cat-back exhaust system is available again for the 6.6 gas engine. I need to go make some money....

  • Like 1
  • 4 weeks later...
Builtrockhard New Member

Builtrockhard

Posted
Posted
On 1/24/2022 at 8:13 AM, powderMonkey said:

Time warp!  I finally spotted the MBRP T304 in stock at Summit Racing, and drove up and got it from their Cleveland store, and also the matte black tip.  I just installed it on the 4-post lift at the shop yesterday.  I only drove the 5 miles home last night because I was exhausted (no pun intended) but it does sound good!  Not too loud in the cab but you know it's there. I am headed back to the shop now to do a couple other things (we are closed today), and I'm going to get some pics and videos, and will reply back to this soon with some info and what I learned from the install.

So what’s the latest? I’m looking to get this system for my 2022 AT4 HD

  • Thanks 1
  • 1 month later...
sweatandsteel Enthusiast

sweatandsteel

Posted
Posted

Well after doing lots of research I discovered the Flowmaster Outlaw stainless dual exhaust system for the 6.6 gas and took the plunge. It was delivered on Friday and hope to get it installed over the next couple of weeks and will update everyone on how it goes.

  • Like 2
Mic_ Enthusiast

Mic_

Posted
Posted
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!

 

 

looks like amazon 

bought all there stock up??

 

https://www.amazon.com/MBRP-S5259304-T304-Single-Back/dp/B00XC1JSFC?th=1

 

CT Chevy Connoisseur Enthusiast

CT Chevy Connoisseur

Posted
Posted
On 4/12/2022 at 7:31 AM, sweatandsteel said:

Well after doing lots of research I discovered the Flowmaster Outlaw stainless dual exhaust system for the 6.6 gas and took the plunge. It was delivered on Friday and hope to get it installed over the next couple of weeks and will update everyone on how it goes.

good luck, personally I didn't even consider anything that wasn't 304 stainless as I don't plan on ever replacing it

  • 9 months later...
Randal Scott Enthusiast

Randal Scott

Posted
Posted

AFE makes a cat-back kit made of 409 stainless steel. For around $600.00. I found a muffler from Walker  21470 with 3.5 inch inlet and outlet. Probably have to add a short piece of pipe to the tailpipe. 

  • Like 1
  • 10 months later...
EPL Enthusiast

EPL

Posted
Posted

I just installed a Borla S-Type Cat Back on my 2023 HD with  a 6.6 gas.

I received it 2 days after I ordered it from S & S Exhaust. 

All stainless with a black tip - looks great and sounds awesome!!

Really satisfied with it!

Install took less than an hour!

  • 1 year later...
Epsilon Plus Enthusiast

Epsilon Plus

Posted
Posted

I just came home from the exhaust shop. Had the place weld in the Magnaflow (assuming a similar one to the online kit) and a MF tip that I bought online. All in I'm at $540. Great price.

 

However.......

 

 

If definitely has a drone at 1,500-1800RPM under light acceleration. Unfortunately, where it spends most of its time in traffic. Don't know if I'm getting old or it's just my ears but I went back and got the stock muffler to take with me just in case I don't get used to it. Its fine below 1500 and above 1800, just has a drone at that unfortunate spot.

 

Exhaust guy was surprised as he says these are just above stock. It really isn't loud, more bass-y for sure which I was shooting for but the drone might drive me back to stock. I'm surprised some of you are ok with much louder and race-y-er mufflers on these. Wonder if its the extra load from the 37s I have on.

 

Overall disappointed so far.

CT Chevy Connoisseur Enthusiast

CT Chevy Connoisseur

Posted
Posted
7 minutes ago, Epsilon Plus said:

I just came home from the exhaust shop. Had the place weld in the Magnaflow (assuming a similar one to the online kit) and a MF tip that I bought online. All in I'm at $540. Great price.

 

However.......

 

 

If definitely has a drone at 1,500-1800RPM under light acceleration. Unfortunately, where it spends most of its time in traffic. Don't know if I'm getting old or it's just my ears but I went back and got the stock muffler to take with me just in case I don't get used to it. Its fine below 1500 and above 1800, just has a drone at that unfortunate spot.

 

Exhaust guy was surprised as he says these are just above stock. It really isn't loud, more bass-y for sure which I was shooting for but the drone might drive me back to stock. I'm surprised some of you are ok with much louder and race-y-er mufflers on these. Wonder if its the extra load from the 37s I have on.

 

Overall disappointed so far.

Could be one of those you get what you pay for kind of deals. I've had the MBRP 304 Stainless Exhaust on mine for about 3 years, love them, not loud but you know I'm coming

Epsilon Plus Enthusiast

Epsilon Plus

Posted
Posted (edited)

Dunno. It's a 22" stainless Magnaflow. Nice muffler. Not short or loud. Just droney in that 300 RPM range. 

 

I need to get it out on the freeway at 70+ and tow something with it before I decide to go back.

 

Good thing is it doesn't bother the wife at all. Maybe I'm just getting used to it since it used to be SO quiet.

Edited by Epsilon Plus
OS RR Enthusiast

OS RR

Posted
Posted (edited)
6 hours ago, Epsilon Plus said:

22" stainless Magnaflow

 

 

Huh.. I've got a 22" Magnaflow knock off (from ebay, 3.5" 5x11 offset/offset). Haven't had it put on yet, guess we'll eventually see if it does the same to mine.

 

Stock tail pipe out the back still?

 

Wonder if a small resonator before the muffler would help?

 

The 18 year old in me has been eye'n the flowmaster Outlaw but, I'm afraid it'll live up to its "Drone master" nickname.

 

Got any pics of it?

Edited by OS RR

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,914
    Total Members
    8,960
    Most Online
    AidenVorpagel
    Newest Member
    AidenVorpagel
    Joined

  • Who's Online   2 Members, 0 Anonymous, 1,290 Guests (See full list)

  • Latest Articles

  • Posts

    • jake111
      Gasser Subforum Has Been Quiet - - So, Regenerative Braking and Using L10

      By jake111 · Posted

      Thanks newdude!  By the time manual selection is needed, I'm probably too much of a control-freak to depend on the transmission sensing braking to activate automatic downshifting.  I would be anticipating the situation and already be manually downshifting.   This truck replaced a 2004.5 LLY diesel with the Allison 5-speed.  Putting it in T/H made noticeable differences (when the torque converter locked, upshift points, downshift behavior).  On this 2024 gasser with the 10L1000 I haven't been able to detect much, if any, difference.  Ok, I can never tell now when the torque converter locks up.  But I also don't notice differences in shifting.  For downhills, I've probably already manually downshifted by then anyway.  Since it's also more awkward (than the 2004.5) to engage/disengage I don't even bother.  Or maybe it doesn't really matter with just a 3k lb. camper in the bed?   Thanks also for the list of reasons the charging system might select various voltages.  However, what I am seeing doesn't fall into any of those categories.  It very definitely, and very consistently, rises after coasting/braking.  Maybe not immediately, but not very long after coasting/braking.  Very consistently drops voltage when no longer coasting/braking.  It might also be interacting with the camper battery charging (I might disconnect the camper and see if it changes the charging behavior).  I also need to recheck turning on headlights for when I want to force it to charge the camper.   Another JR, in June I converted the camper to LiFePO4.  Since it's not a good idea to try to charge lithiums directly using truck, I installed a Victron Orion XS DC-DC charger (which BTW is AMAZING!!).  Being cheap, I only had to buy that one item (besides the battery, of course) to do the conversion.  The camper OEM 120v battery charger (only 19 years old and works perfectly) and the truck feed the input to the DC-DC charger (not at the same time).  But I didn't want the camper charger feeding back to the truck so I kept the old separator.  I considered replacing the separator with a 30amp diode but that means more work and might add another 1/2 volt drop.  One thing that surprised me was the voltage drop over the long 10awg wire run, so I can only charge smoothly at 8 amps (because the DC-DC charger is completely configurable).  Another reason I don't want an added voltage drop with the diode.  I might also be a little lazy but all this work is being done under the sink with a small cabinet opening.    
    • davester
      cam upgrade in CA

      By davester · Posted

      apparently CA smog is (or at least was)  checking that the vehicle is using the oem and/or a ca smog approved tune, so I expect you'll fail inspection doing it.
    • davester
      Possible lifter tick after DOD delete

      By davester · Posted

      yes, leaking exhaust will mess up o2 sensor readings, which in turn messes up fuel trims.
    • Grumpy Bear
      Sugar Bears 2015 GMC Terrain SLE-2 2.4 AWD

      By Grumpy Bear · Posted

      286,740 Mile Services   8/6/2026   New AC Compressor. Refrigerant oil and dye, evacuate and charge system.  New exhaust system from cat back.  New Iridium plugs plus replace #3 coil Repair/rewire headlamp wiring (passenger side) and replace all forward bulbs. Polish lenses of both assemblies.  Pull rear rotors, clean and adjust parking assembly. Inspect, clean and grease front calipers. Check pads and shoes.  4 wheel power bleed of brake system. Dot 4 Reset idle speed 50 rpm higher New Serpentine belt.    Will need new pads in the rear in about 5K more miles.    Tax Title and License out the door just short of a grand.    AC clutch had bitten the dust. 1 year warranty on the pick and save replacement. Thing will make a Polar Bear cry Uncle.  He spent quite some time on the wiring. It was in the harness and he does nothing half. I got off cheap. I have considerable more light down the road. Sylvania Silver Star replacements.  Gas seal between the porcelain and shell of plug #3 was blown, cooked the coil. That was the cold miss.  Love the new exhaust. I can sneak into the neighborhood again.  Nice to have a working parking brake again. Belle Tire never got it done. That was disappointing.    This was one of her bigger bills and still way cheaper than a payment even given the oil consumption. This thing cost me under a hundred a month in repairs and normal routine costs. What is my incentive to replace it? 🤔           
    • AidenVorpagel
      cam upgrade in CA

      By AidenVorpagel · Posted

      hello I recently bought a 2012 gmc 1500 with a 5.3 and have a AFM disabler on it I'm interested in doing a cam but I'm worried if I remove the AFM system I will fail smog does anyone have info if they are able to detect that or a work around to it (not talking about hot smogging) please let me know thank you  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...