Love that body style. Mine is a 2004 2500 HD. That 6.0L engine is a beast. 300,000 mi and still lays patches for as long as your foots heavy.. lol life with a lift in your shop... ahhh yes... one of these days I'll have one too..

Nice. With my GMC 3500HD dually (7.4 Vortec), I opted for the Holley Flowmonster. It has two 3" inlets and two 3" outlets. It's a straight-through stainless steel Magnaflow-style muffler with two perforated pipes and packing. Sounds pretty darn good.

Sounds good man, I've got the Super 44 exhaust system on my 06 1500, these Flowmaster exhaust systems have a very nice sound.

I went with a magnaflow straight through 3 inch, there is only drone at 50mph-ish, but still loud enough to turn heads

That’s a very refined and deep sounding exhaust for a 6.0

I finally put a dual exit super 40 in my truck and it’s honestly way quieter than what I expected

Nice sound on that flow master!

I'm running the 40 series on my 2012 gmc z71 I love the way it sounds

Finally someone that knows how to weld correctly. Your welds don’t look like worms gone wild. Just think the power company loves to see people welding. They re counting the number of turns your meter turns , ha, ha.

Sounds really good 👍👍

Sounds great! I wish mine sound that nice.

Sounds great! I did the same thing on my truck only went with the flowmaster 50 series.

I’ve got the super 10 Flowmaster on my 2002 6.0 2500 work truck. Sounds about perfect to me.

Nice Sound bro👍👍❗

I just put the 40 series on my 02 1500 that I swapped to the 6.0 and 4l80e, sloppy stake 2 cam. Straight pipe was ridiculous. It's stock manifolds, stock piping which is not true duals. Y's up before the transmission. But it sounds great. I love it. Especially after running straight pipe for 2 weeks.... little drone at low rpm. But none at all while accelerating.

I have a similar set up on my 2001 1500HD but it’s ran out the back with 4 inch echo tips. Sounds good

On the factory muffler the drivers side exit pipe is a dumby pipe, it goes back into the muffler tuning chamber. It basically does nothing. So it only has 1 exit pipe functioning.

Like everyone else has said, if you had tailpipes then you probably wouldn't have drone issues. It would sound a lot better that way too.

Truck is looking great, Sir.

It sounds great!

My 04 2500 doesn't have cats. And I have dual 3 inch dynomax race bullets. In to the factory Y into a 4inch tip in the factory location. It's stupid loud. A little annoying at times, but really no drone

I do'nt care for Chevolet products but that sounds damn good.

If it had high flow cats or no cats, would it be much louder?

Hello, I just watched your posted video of Flowmaster muffler install and after watching it made me think about exhaust fumes coming into the cab. So, in looking at the muffler i noticed you did a turndown stile (no tailpipe) and i know you mentioned you may change it later but if I were to do that type of style (turndowns/grass burners) will fumes likely be coming into the cab of the truck or is it ok? so im wondering when i do my muffler replacement if i want to do turndowns or add tail pipe. So does it, are fumes likely to come into cab with turndowns at end of muffle undernieth cab? I know that some folks do that style and ive always wondered uf fumes bother them at all. I have same truck. Thank you

add longer tips or throw in more piping it will take the drone away I put same muffler on my Tahoe and it was super annoying when doing 100kph, I added like a foot more of piping and it went away

have 2 of these on my 98 k2500 with A 5.7 vortec that has a cold air intake. those two upgrades alone make a difference compared to the stock 5.7s ive driven

I got a glas pack on mine and it drons bad i been lookin in to other mufflers and systems and this helps my research better

nice HD truck

Did you do anything with the intake or just the exhaust? I'm thinking about going cold air in and Flowmaster out.

What shock u running

Sounds nice and mean

Friend of mine has the same truck will all stock exhaust other than two 3" pipes instead of the muffler. Very throaty and only snaps at a certain rpm.

Great Weedburners. Great result. Thanks for posting 👍

So you like the flowmaster muffler on a daily driven truck? Do you think.its to loud or its ok? I wanna get the 40 series on my 2016 Silverado 6.0 liter. I have the 50 series now. Just wanna go a little bit louder

Probably to late to tell you but always add atleast 2 to 3 foot of pipe behind a Flowmaster to give it some tone. If you don't it just sounds like a dump truck

a set of full tailpipes would help allot with your interior sound issues, ending the exhaust under the bed leaves too much sound resonance

Factory probably saved $3.50 (tree fitty) per truck by going back to single pipe from the muffler back. A very experienced race engine builder told me that for gas engines...unless you are regularly seeing RPMs above 5000K, you just don't need more than 2.5 in pipe, not even on a turbo engine. A truck particularly needs low end torque, not high rev capability. Does not apply to Diesels. What you did here was just right.

When are you doing rocker panels?

Cut my muffler off ran to stock tail pipe same place as stock happy with sound!

If you cut it from the bottom you won't have to worry about it binding

of course you have drone its dumped under the truck throw so tail pipes on it sound way better

Does the truck sound a lot better then stock ???? I have a gmc 2500 hd 6.0 2005 Trying to decide if I should do this ??

here is my two cents if people complaint about drone while cruising then don't change the factory set up,personally i go with flowmaster over any other exhaust system i'm a fan boy i guess?on my page i have exhaust clips of a dakota i use to own with two separate systems in the end it ended up with the chambered muffler similar to flowmaster but not as pricey,i also had a 77 Ford flat bed with a 400 engine cammed and i ran a full flowmaster exhaust although i didn't record any clips..

any seat off the pants noticeable power increase?

They will cook that shock

My brother has a 2003 crew cab short bed 2500 with the 6 liter and he ran a thrush muffler to a 4 inch tail pipe and it sounds amazing. It has a mild volume and a great time with very low drone in the cab. Just an idea if you decide to change it up.

nice video sounds great. I was gonna buy a muffler for my truck but I don't know which muffler I should buy

What size tires do you have in the truck?

I have the same model truck, I noticed that there is a whining noise when accelerated mine does the same, is this a sign of a bad bearing somewhere or what?

Sounds good but bet if you change the weed burners for longer tubes it would sound even better! I wouldn't mind the drone bet it sounds like a monster! So they don't have 3" inlets available? I gotta get one for my 6.0!!! Cheers!

Flowmaster's Delta Flow series has less interior drone.

I don't have a welding machine could I use sum clamps?

Why not get a muffler with the right size inlets instead of using reducers that restrict flow and hinder preformance?

Sounds good. Your rear shocks are upside down though.

Does this add better fuel mileage

It will sound like a bag of bumble beez if you put that muffler in backwards

You tried delta flows? They got great street manners but still offer enough ear candy

I'd love to know where you found that grille, or is it just the stock one that's painted matte black

a lifted truck without negative offset wheels 😱

Not loud enough for my taste but it does give it a bit more of a guttural bark. you forgot to fire it up without any mufflers at all too haha.

You missed a golden opportunity to rev it straight pipe before the install! Sounds good, though. At what RPM is the interior resonance? I have horrible resonance at 3000RPM with dual 3" and even with 2 mufflers and 2 resonators. I'll be doing some sound deadening and insulation when I re do the rear carpet. Maybe that'll kill the issue for me? We'll see....soon as the remodel of my house is done.

To much back pressure if you put it in backwards

Just cut my Escalades 3.5 inch stock exhaust off with the cheapest angle grinder Walmart had to offer

Things that might help with a project like this: Flowmaster 40 Series: amzn.to/2QkX7vO Flowmaster 50 Series: amzn.to/2Eez10k Dewalt Saw: amzn.to/2FFrCZq This video contains affiliate links, which means that if you click on one of the product links and buy, I'll receive a small commission.

Single 3.5" rated at 503 hp. Dual 2.5 rated at 513 hp

Sounds kinda wierd... doesn’t sound like a Flowmaster

Ask the shock what it thinks lol

Great video but, your information on pipe size and flow is incorrect. I dont have cfm numbers but I do have gallon per minute. 3.5" pipe will flow 160gpm where as 2.5 will flow 65gpm X2 for duals. Which makes 130gpm. All data aside its not gonna make a performance difference on a stock 6.0!

super 10s sound way better.

Needs tailpipes for best sound and less drone.

ummm you get sill rust fix it bad

Diesel should have come with 4" the engine breathe better

Sounds mean

Quiet

Imop, sounds like crap.

lift is a bit too high

Aaaaaaaaand that's why people put glass packs on trucks instead of this pansy crap

Cut off the cat and it will sound alot better

Sounds like a giant farting into a coffee can. Flowmaster just doesn't do it for me on stock motors. I like the way they sound at idle. Then anything over 50 percent throttle just sounds trashed.. Am I crazy? Or do others feel the same. Flowmaster is always so hit and miss.

Truck is too high....looks tippy, like a ballerina

The smaller the exhaust the more resturfull it will be not more power

Sounds like a giant farting into a coffee can. Flowmaster just doesn't do it for me on stock motors. I like the way they sound at idle. Then anything over 50 percent throttle just sounds trashed.. Am I crazy? Or do others feel the same. Flowmaster is always so hit and miss.