2014+ Exhaust Systems & Mufflers

14SLTZ71 · October 1, 2014

I saw that one too. I am tempted to try it with an 18in magnaflow or a super 40.

It would be nice if Borla would sell just the front pipe with the valve, but that's not happening, I already asked them.

Edit: they would probably want too much for it anyways. I think GM owns the rights to the valve or something like that.

Edited October 1, 2014 by 15LTZZ71

revitupfaster · October 1, 2014

Great review answered a lot of questions I had. If you can post a video once you get your tips. Did you order from the dealer or from an online vendor?

I'm in Canada, and I don't think there are any "Online" places where we can order genuine GM parts, so I just had to bend over and have my dealer order it for me.

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Edited October 1, 2014 by revitupfaster

revitupfaster · October 1, 2014

Nice Review. I am thinking the bypass might prevent freezeups in the colder climates as well. That would be a good thing. I still cant decide on the gm borla or the S type.

The GM Borla apparently uses the Borla "Touring" muffler. I've read that Borla won't explicitly confirm that, and claims the muffler used is "according to GM Specs". Whatever, the system I have so far is pretty quiet, .......especially inside the truck. As I said I'm waiting for my son to come this weekend, where I'll get him to drive it, so I can give it a listen from the outside. Oddly enough, I think not having the tips on also affects the sound somewhat, especially since I have the dual side exit, and the ends of the Borla pipes are a fair bit under the truck......we'll see once I get the tips on. Anyway, it's supposed to get somewhat throatier once it "breaks-in"

If you want to go with the Borla "Sport" version, which I'm sure will be quite a bit louder, you can't get that from GM, so if you get it direct from Borla, you won't get the exhaust valve and bypass pipe. 15LTZZ71 on this board had the non-GM Borla "Touring" set up, and apparently it had the dreaded "Drone/Flutter/Helicopter sound whatever you want to call it, so I would assume the "Sport" version would be the same.

Good Luck

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Edited October 1, 2014 by revitupfaster

revitupfaster · October 1, 2014

That's the best pic of the adaptive valve on the Borla I have seen. Couldn't find that part number though, might be missing the first digit. I don't think that is the same part as the stock one. The axis for the flapper looks more centered on that one. If we can find that part, should be easy for a muffler shop to build that bypass(or overflow) tube around it too and put it upstream of any muffler.

I would bet that even if you could find a part number for the valve, that it will not be a saleable part, and only sold as part of the muffler assembly. I was in the power sports industry for many years, and we ran accross this a few time, where you couldn't buy the part, just the complete assembly.

Probably the only "reasonably" priced way to try "Building you own" system would be to buy the exhaust system off a wreck, if you could find one cheap enough, or use one of the valves selling on "E" Bay........don't know if they are original or not.

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Edited October 2, 2014 by revitupfaster

revitupfaster · October 4, 2014

Finally, the Borla "Tips" came in, and I ran over to my dealer and had them installed. I wouldn't have believed how much of a difference in the sound the tips make.

When the system was first installed and I was driving it around for 3-4 days without the tips, I must admit I was thinking that "maybe this system is too quiet, even for me". I'm sure a lot of the quietness, is just the fact that the whole truck is a lot quieter. Anyway, with the tips on, it sounds just like the one I had seen, and tried on the dealers "stock" truck. Nice "Bark" on start-up, and low growl when you get on it. Pretty much exactly the way the GM Borla video describes it. I guess the tips concentrate the sound or provide some sort of "echo" effect ,that gives it just a little more depth to the sound. If over time, the sound enhances even more, that will be just icing on the cake.

Overall, I'm a happy camper. Very well made product, great sound, great look (IMHO), V4 issues under control, everything you want but pricey.

Here's a few pics of the tips, I have a pretty decent video, but I don't know how to post a video.........is there any tutorial about posting video on the site anywhere?

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Edited October 4, 2014 by revitupfaster

tsdrumm · October 5, 2014

Anyone have any sound clips of the magnaflow 4" cat back on a 6.2?

Edited October 5, 2014 by tsdrumm

Truckmed13 · October 7, 2014

Finally, the Borla "Tips" came in, and I ran over to my dealer and had them installed. I wouldn't have believed how much of a difference in the sound the tips make.

When the system was first installed and I was driving it around for 3-4 days without the tips, I must admit I was thinking that "maybe this system is too quiet, even for me". I'm sure a lot of the quietness, is just the fact that the whole truck is a lot quieter. Anyway, with the tips on, it sounds just like the one I had seen, and tried on the dealers "stock" truck. Nice "Bark" on start-up, and low growl when you get on it. Pretty much exactly the way the GM Borla video describes it. I guess the tips concentrate the sound or provide some sort of "echo" effect ,that gives it just a little more depth to the sound. If over time, the sound enhances even more, that will be just icing on the cake.

Overall, I'm a happy camper. Very well made product, great sound, great look (IMHO), V4 issues under control, everything you want but pricey.

Here's a few pics of the tips, I have a pretty decent video, but I don't know how to post a video.........is there any tutorial about posting video on the site anywhere?

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Would love to hear that video you made! You can post to youtube and then post the link here.

Edited October 7, 2014 by Truckmed13

revitupfaster · October 8, 2014

Would love to hear that video you made! You can post to youtube and then post the link here.

Would love to post it for you, but everytime I try to log onto "youtube" I keep getting a message saying "you're not authorized for this service" or something like that.

My son was out on the weekend, and I had him drive the truck while I was outside. There was a lot more sound from the outside than in.......damn, these 2014's are quiet inside the cab. I was pleaseantly surprised with the outside sound, it completely comes up to my expectations. Takeoff was just a nice rumble, plenty enough to be heard, nice and throaty. On a drive-by at about 40mph, then hitting the gas, yielded a serious "Bark", much more than I would have expected, given how quiet it is inside the cab. This throaty roar continued of course until you let off.

As I said previously, you can very slightly hear the V4 sound, but to someone that had never heard a loud V4 "Flutter" they wouldn't even notice it. Anyone that says they have absolutely no V4 drone/helicopter sound with any of the aftermarket exhaust systems, either can't hear it themselves, or they won't admit that it's there for some reason, or it's so loud inside the cab you can't hear it anyway, or they have turned off the AFM. This GM Borla system by far, has to be the quietest "Inside-the-Cab" sound levels I have ever experienced, and I've had 2 Magnaflow systems on other trucks prior to this. If my wife is standing outside the truck when it fires up, I kinda get the "why do you want something that loud" look, but inside, she doesn't even notice it at all.

There is a video, produced by Borla I think, that showcases the GM Borla system. I'm sure it was "linked" somewhere on this thread. It shows a Burgundy coloured 2014 Silverado with the GM system on it. The sound on that video, is pretty much it. If anything, the sound on the video may be just a little subdued compared to "real-life". Maybe mine is already "Breaking-in", and the sound is a little fuller, whatever, I'm very happy with it. Prefect for us "Old Guys"

bdbake01 · October 10, 2014

Anyone that says they have absolutely no V4 drone/helicopter sound with any of the aftermarket exhaust systems, either can't hear it themselves, or they won't admit that it's there for some reason, or it's so loud inside the cab you can't hear it anyway, or they have turned off the AFM.

Or, maybe, there are other exhaust combos which don't, in fact, have any perceptable drone. Another option could be that looking at it from the other side of the coin, those who spent $$$ on an expensive, branded exhaust which claims to eliminate any drone feel better about their investment if they can claim that their $$$ was well spent and CLEARLY out performs the cheap options.

Not trying to start a flame war, but I'm sure there are other people fully qualified to express an opinion about the presence or lack of V4 drone in what they hear. I have noticed one common thread though. You don't want drone? Keep the flapper. Seems Borla figured this out as well.

The wife gave me down the road for months while I complained that I wanted something louder. "Why do you want that? I don't want to ride in some hopped up fart wagon" yadda yadda yadda. I decided to not listen, changed it anyway. Rode her around for over a month, even a long trip to the mountains and back. Was VERY careful to always let her get in the truck before I started it. On the way home one day I asked about the exhaust again and she expressed her opinion. Same answer, "NO!". Then I remote started it as she was walking toward the side door of the house. She spun around rather surprised and accused me of playing a trick on her.

When the swelling went down in my eye I could see the smirk grin of "Ok, ok, you fooled me" on her pretty pretty face. She's a sweet gal.

revitupfaster · October 12, 2014

Or, maybe, there are other exhaust combos which don't, in fact, have any perceptable drone. Another option could be that looking at it from the other side of the coin, those who spent $$$ on an expensive, branded exhaust which claims to eliminate any drone feel better about their investment if they can claim that their $$$ was well spent and CLEARLY out performs the cheap options.

I agree completely, and certainly did not want to start any controversy. I guess I should have just left my comments at saying that this is the quietest "in-cab" system I have heard.

Yes, the fact that it is very quiet inside certainly does help me justify the cost, and I would have had "Serious" buyers remorse, had there been a V4 issue. The lack of the "V4" issue was the primary justification for me.

I think all of the "Name Brand" so called "Premium" exhaust systems are way over priced, and I still think I'm kinda nuts for spending that much just to get a little more sound, that everyone outside the truck will get to experience far more than me.

pkpouttu · October 23, 2014

Installed the aFe exhaust last week. Wouldn't mind it a tad louder but its got a nice rumble to it. Will keep me out of trouble hopefully.

Ljrussell94 · October 24, 2014

I took my magnaflow muffler off if anyone is interested. I actually have two...One is the 3.5" inlet 3.5" outlet 22" magnaflow muffler and the other is a 3.5" inlet dual 2.5" outlet 22" magnaflow muffler. The first one is about 9 months old Nd the second one is one day old. Jus didnt like how loud they were so went back to stock. Will make yall a good deal if anyones interested let me know. Thanks

revitupfaster · October 24, 2014

I took my magnaflow muffler off if anyone is interested. I actually have two...One is the 3.5" inlet 3.5" outlet 22" magnaflow muffler and the other is a 3.5" inlet dual 2.5" outlet 22" magnaflow muffler. The first one is about 9 months old Nd the second one is one day old. Jus didnt like how loud they were so went back to stock. Will make yall a good deal if anyones interested let me know. Thanks

Wow........the 22" Magnaflow's from what I've read, are pretty tame. Did you find there was too much cab noise, or was it the outside sound that bothered you. Just wondering, it's funny how sound levels are preceived by different people.

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Ljrussell94 · October 25, 2014

Wow........the 22" Magnaflow's from what I've read, are pretty tame. Did you find there was too much cab noise, or was it the outside sound that bothered you. Just wondering, it's funny how sound levels are preceived by different people.

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Well its really not that loud but it is alot louder than stock. If youre cruisin you cant hear it at all but when i gave it just a little bit of gas it would get annoyin to me a little bit too much for me. Everybody that drove in it didnt think anything bad about it but i guess if you drive aggresively like me it gets annoying. So no its not that loud its pretty tame unless you stomp on it. But everyone has their own thoughts about them lol