Jump to content

Magnaflow on 2018 6.2l 8-speed

cruzcode

By cruzcode
in Engines & Drivetrain

Recommended Posts

cruzcode Enthusiast

cruzcode

Posted
Posted

Okay, so I listened to my friend’s 5.3 rig from @454motorsports and he has a 3.5” SI / SO Magnaflow muffler (P/N 12909). I loved it!

 

I ordered one off of Amazon $117, it came next day, and went down to my local muffler shop to have the Resonator after the axle, the flapper valve, and the factor muffler cut off, and replaced with the Magnaflow muffler, and it came out great on my 6.2L!

 

The result is a great cold start tone, warm start tone, idle tone, and you can definitely hear and feel the response with any level of the throttle, with zero drone. If you want something even louder, I believe you can select a slightly shorter version of the same muffler.

 

Highly recommended.

 

RC

 

a57cd2c2a2a1de51d687546c53a5697f.jpg

 

beb01b2b8a10514d21d8fe0fc2044498.jpg

 

 

Sent from my iPhone using Tapatalk Pro

QUIKAG Enthusiast

QUIKAG

Posted
Posted

I did the exact same thing yesterday too except I kept my resonator.  I love this Magnaflow muffler on my ‘18 6.2.  Nice smooth, mellow tone, but you also know it’s a pretty sophisticated larger displacement V8 with the exhaust note.  I’m really happy with it.

 

If the sound becomes too quiet I’ll go back to my shop and have them cut the resonator off, but I’m pleased for now.

YukonXL04 Enthusiast

YukonXL04

Posted
Posted

I did the same on my 18 6.2 but used a Borla xr-1 muffler. And I kept a the over axle bend and added a short piece of 3.5" to come down right at the spare tire.

cruzcode Enthusiast

cruzcode

Posted
  • Author
Posted
I did the exact same thing yesterday too except I kept my resonator.  I love this Magnaflow muffler on my ‘18 6.2.  Nice smooth, mellow tone, but you also know it’s a pretty sophisticated larger displacement V8 with the exhaust note.  I’m really happy with it.
 
If the sound becomes too quiet I’ll go back to my shop and have them cut the resonator off, but I’m pleased for now.


I’m stuck between having a very meaty sounding exhaust with more CFM, and wanting something that is reasonable, timeless (works for me at any age, since I don’t plan on selling the truck ever), which is why I went with the 22” Magnaflow. It is almost too quiet, but I’d rather err on the side of it being too quiet than having a drone, killing the in cab experience with the Mrs.

Glad you like your setup.

RC


Sent from my iPhone using Tapatalk Pro
cruzcode Enthusiast

cruzcode

Posted
  • Author
Posted
I did the same on my 18 6.2 but used a Borla xr-1 muffler. And I kept a the over axle bend and added a short piece of 3.5" to come down right at the spare tire.


Yeah, I forgot to mention that I did the same thing. My muffler guy essentially left the over axle bend in place, cut out my Factory muffler and flapper welded in the Magnaflow, then moved back. Then cut out the resonator after the axle bend, and it extended down the pipe a short bit next to the spare tire. You can’t see it unless you look under the rig.

RC


Sent from my iPhone using Tapatalk Pro
cruzcode Enthusiast

cruzcode

Posted
  • Author
Posted
I did the same on my 18 6.2 but used a Borla xr-1 muffler. And I kept a the over axle bend and added a short piece of 3.5" to come down right at the spare tire.


How do you like your Borla? I want to do a video of mine for the sound, but haven’t yet.

RC


Sent from my iPhone using Tapatalk Pro
QUIKAG Enthusiast

QUIKAG

Posted
Posted
5 minutes ago, cruzcode said:

 


I’m stuck between having a very meaty sounding exhaust with more CFM, and wanting something that is reasonable, timeless (works for me at any age, since I don’t plan on selling the truck ever), which is why I went with the 22” Magnaflow. It is almost too quiet, but I’d rather err on the side of it being too quiet than having a drone, killing the in cab experience with the Mrs.

Glad you like your setup.

RC


Sent from my iPhone using Tapatalk Pro

 

Agreed.  I’d rather have it a little quiet than a little loud or too loud.  I already went down the too loud road with a full Borla ATAK catback.  Great sound and awesome if you wanted to always be flooring it all over town with everyone hearing you, but it’s also a work truck for me and doing a cold start at the end of the work day in front of the office was a bit much.

 

i think the 12909 is a perfect compromise for me to have a little nice V8 sound but not cause too much of a disturbance with the Mrs or people at work.  Plus, it’s nice to enjoy an otherwise very quiet truck sometimes but also know you have a nice V8 under the hood, something the Ford ecoboost boys can’t say. :D

cruzcode Enthusiast

cruzcode

Posted
  • Author
Posted
Agreed.  I’d rather have it a little quiet than a little loud or too loud.  I already went down the too loud road with a full Borla ATAK catback.  Great sound and awesome if you wanted to always be flooring it all over town with everyone hearing you, but it’s also a work truck for me and doing a cold start at the end of the work day in front of the office was a bit much.
 
i think the 12909 is a perfect compromise for me to have a little nice V8 sound but not cause too much of a disturbance with the Mrs or people at work.  Plus, it’s nice to enjoy an otherwise very quiet truck sometimes but also know you have a nice V8 under the hood, something the Ford ecoboost boys can’t say. [emoji3]


I couldn’t have said it better. Now make no mistake, when I hit the gas, the exhaust wakes up and lets outs a nice roar! Perfect blend...

RC


Sent from my iPhone using Tapatalk Pro
YukonXL04 Enthusiast

YukonXL04

Posted
Posted

We did a magna flow on my uncle's 5.3 with duals out the back. It's pretty dang quiet inside the truck. You hear it very slightly under normal driving. Definitely no drone.

 

Now my Borla on the other hand. It's fairly loud. But with the low cruising rpms of the 6.2/8spd it can almost disappear while just cruising. It doesnt drone at all, but you can always hear it. Turn the radio on a couple clicks and you cant hear it anymore. You dont have to raise your voice or anything to talk over it. But when you stomp the gas it sounds like an absolute monster. Which is exactly what I wanted. But I'm relatively young and have always liked loud trucks. It's a good reminder that oh yea, I have a 6.2 and it's a beast lol

Racindave Enthusiast

Racindave

Posted
Posted
56 minutes ago, YukonXL04 said:

We did a magna flow on my uncle's 5.3 with duals out the back. It's pretty dang quiet inside the truck. You hear it very slightly under normal driving. Definitely no drone.

 

Now my Borla on the other hand. It's fairly loud. But with the low cruising rpms of the 6.2/8spd it can almost disappear while just cruising. It doesnt drone at all, but you can always hear it. Turn the radio on a couple clicks and you cant hear it anymore. You dont have to raise your voice or anything to talk over it. But when you stomp the gas it sounds like an absolute monster. Which is exactly what I wanted. But I'm relatively young and have always liked loud trucks. It's a good reminder that oh yea, I have a 6.2 and it's a beast lol

Did y’all remove the flapper on your uncle’s 5.3?

YukonXL04 Enthusiast

YukonXL04

Posted
Posted
4 minutes ago, Racindave said:

Did y’all remove the flapper on your uncle’s 5.3?

Yup. No flapper on either truck

Slizzo Enthusiast

Slizzo

Posted
Posted

So you go through the trouble of posting pics but not a video? SHAME!

 

How about letting us all hear a bit of it? :)

cruzcode Enthusiast

cruzcode

Posted
  • Author
Posted
So you go through the trouble of posting pics but not a video? SHAME!
 
How about letting us all hear a bit of it? [emoji4]


Alright, I’ll get a video going.

RC


Sent from my iPhone using Tapatalk Pro
jimbowattz Enthusiast

jimbowattz

Posted
Posted
 Alright, I’ll get a video going.  RC

 

 

Sent from my iPhone using Tapatalk Pro

 

 

 

Here's audio of my 2018 6.2L with Magnaflow 12909 with flapper clamped open and resonator intact. I had flapper in normal position on way home from muffler shop and it sounded no different from stock at any RPM. Claiming open flapper was the trick. Perfect.  It is nothing to write home about and is fairly quiet and not loud. It's how it should have come from the factory, or one level up but not more. It's quieter than most will want, but perfect for me. I use my truck at work functions and to carry colleagues around from time to time so I needed it quiet. Just enough to let you know you have a V8 under the hood.  I had an 18 inch Magnaflow in my NNBS and it was too loud for me the times I had work folks along.

 

Have BlackBear tune coming to me this week so it should run great by weekend, fingers crossed.

 

 

 

 

 

 

 

jimbowattz Enthusiast

jimbowattz

Posted
Posted

While it's certainly not a loud setup, the video doesn't do it justice. It has more growl and deep tones in person. Lots of ambient noise in my surroundings.

 

 

 

 

 

 

 

 

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      "Teardown" is complete. Head surfaces are clean and ready, new intake is prepped and ready. Coolant drained and water pump is removed, radiator is removed, new hoses and pump are ready.   The replacement intake is also from a '95 (with I think 260k, the odometer said). Noticeably less pitting where it covers the rear coolant passages. I'm not sure if that's a tribute to more frequent use, more frequent coolant changes/upkeep, or if the intake was machined at some point. But it appears I found a good one.   My coolant hoses were original, and the lower hose still retained the factory spring inside. It's not really rusty, but it's got deposits all over it. Unsure if I should re-install it (will thoroughly clean it first). Someone said hose technology has gotten better since 1995 (has it?) and I don't need the spring. I think modern EPDM is what made those hoses last from 1995-2026, so it's a question of how much suction can the water pump really pull, and will it collapse the hose without a spring?   I'm stopped and waiting for parts, however.   When I first brought the truck home, the fan was intermittently hitting the radiator shroud. I could see someone had monkeyed with the shroud (put a bunch of cardboard as a spacer between the upper/lower shroud halves. Someone said the motor mounts have likely failed and the engine has sagged. I wasn't sure I believed that. The engine is really solid in its mounts: To remove the old intake I *just* nearly permanently welded to the heads with freshly cured RTV and gasket snot two weeks ago, I literally had to use the arms on my lift and a chain with a bolt attached to the intake to pull it loose. It almost picked the front of the truck off the ground before ....scuuuuuuuuuuup.... I could actually hear the gaskets tearing and it broke loose and the whole truck settled back down. Motor barely moved.   SO, those parts I'm waiting on... The lower radiator mounts/bushings had completely failed. The radiator needs to be insulated from the rad support, and the bushings help the rad stand at the correct height. The plastic "baffle" was also destroyed at some point. Someone had attached the shroud to it incorrectly, overlapping a joint that should have been underlapped, creating another suspect issue potentially causing things to hit the fan. Broken tabs, side is busted off, and it's perma-formed/bent where it was jimmied incorrectly.   The baffle? Unobtainum. Long since discontinued from GM, of course. Aftermarket/capa/chinese? Also unobtanium. In GM's infinite wisdom, it appears there are at least two different variations whether the Blazer is 2 or 4 door, and I can't yet tell if they shared the same part with the S-pickups. Plan B, if I can't find a viable used one, will be to create a bracket to re-assemble the critical joint I need to seal a gap with the shroud. But that will bug me, it won't be...perfect.   The water pump bolts appear to have been installed with...plumber's putty. I guess, sure, if it works...? I've found a few "backyard fixes" like that. Someone's been here before....   If I can't find someone to jam bamboo under my fingernails to fill my free time this week I think I'll install the driver's power window motor and replace the rear door speaker that's inop. I've got a genuine GM "9.5" ohm working replacement. Why GM used a non-standard resistance....nevermind. Of course they did, you can get more sound from a cheap factory amp that way.   And the saga goes on...
    • glenn27
      Different requirements for oil filters?

      By glenn27 · Posted

      // Thank you, also for your  response. More information is always good. This 2013 GMC is most likely my 'forever truck"-I'm 77 and retired...and truck only has 42K on it-very clean-so I try to keep it that way.  Tks again for your  response- glenn
    • smooth68
      Alternate wiring for Kicker sub with Bose system. (DO THIS)

      By smooth68 · Posted

      I started my install this weekend. Everything was pretty straight forward but I ran into one issue with running power through the firewall. The nipple grommet on my High Country already has a small harness running through it - has anyone else ran into this issue? And on the engine bay side, does the wire basically just penetrate the factory wiring boot? I did this on my '22 Trail Boss and it seems much easier but thats been a few years. My other thought would be possibly drilling a new hole adding a rubber grommet just to the lower left of the factory hole. Thoughts?   Has anyone used a T-harness off the Bose amp and obtained power from there? It seems a little odd that such a small amp needs 3 power leads
    • glenn27
      Different requirements for oil filters?

      By glenn27 · Posted

      ///// Ok--Thanks for that info--I could not find yesterday when I looked for the specs on that NAPA filter what I wanted. Their website is not very user friendly. I buy all teh filters for  our three vehicles once or twice a year. Have always run NAPA Gold on everything I own....I buy it thru my Son's account for his business-which he has a Heavy Equipment repair shop-one reason he uses NAPA so much-they have such a full line of coverage for just about anything/anywhere- He gets s  good discount because of volume bought. Anyway-Thank you -Sir for your response.   glenn
    • PhilB
      No 12v outlets in 2026 gmc Sierra

      By PhilB · Posted

      It is possible to add your own 12v outlet to your truck.  Check out this video:   I verified via GM Upfitters that pin 31 is the same on the 1500 trucks.  The wire is GM part number 84779405.   You can get the GM 12v outlet from Amazon  https://www.amazon.com/Genuine-Accessory-Receptacle-25774623-13549530/dp/B0F1H9YRGF EWAY 12 Volt Power Adapter for GM   https://www.amazon.com/EWAY-Chevrolet-Silverado-Cigarette-Ignition/dp/B0915RRW6Q/ref=sr_1_1?   I just haven't figured out a good place to put the 12v outlet in my truck.   Some people are getting USB-C to 12V adapters  https://www.amazon.com/WYMECT-Cigarette-Lighter-Socket-Adapter/dp/B0F87WNQKB/ref=sr_1_1_sspa? Not sure if they provide the correct amperage that a device like a tire inflator would need.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...