Borla exhaust

[2manycars4me]

Taking the plunge and ordered the GM Borla exhaust. Found a place about $400 cheaper with tips than a dealer could offer. I should get some shipping data on Monday and then plan on putting it on. Can't wait to test it out.

 

[gdfein]

Following. Pls post results.


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[TechSupport]

The part number is the same from Borla and GM. The only difference I found was it doesn't come with tips from GM. Most places I've looked are about $200 less then from GM. I'm going Borla for my Escalade. Don't know if I want the sport or touring system. Did you or are you planning on doing a CAI also?

 

[cardude2000]

Ok still waiting for one with a 3.5" pipe to match the 6.2L engines. Not sure why they haven't done it yet! It's available for their 6.2 trucks!


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[TechSupport]

I called and asked them why the pick up exhaust is 3.5" and the SUV is only 3" I was told it for sound inside the SUV vs under the pick up bed. Something with the muffler size and air velocity.

 

[cardude2000]

I called and asked them why the pick up exhaust is 3.5" and the SUV is only 3" I was told it for sound inside the SUV vs under the pick up bed. Something with the muffler size and air velocity.

Yeah, either way I can't bring myself to constrict my airflow further just to make the exhaust sound a bit meaner...

Really sucks because I'd love to drop in a throatier exhaust!


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[TechSupport]

Yeah, either way I can't bring myself to constrict my airflow further just to make the exhaust sound a bit meaner...

Really sucks because I'd love to drop in a throatier exhaust!


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Have you seen the inside of the stock muffler? The stock exhaust may be 3.5" but you can't even shine light through it. So with the Borla being 3" with a "free flow" muffler it kinda makes sense that the truck would breathe better. Yes the Magnaflow and Gibson come 3.5" but I'm not a fan of how they sound or look.

 

[NowZoomer]

The part number is the same from Borla and GM. The only difference I found was it doesn't come with tips from GM. Most places I've looked are about $200 less then from GM. I'm going Borla for my Escalade. Don't know if I want the sport or touring system. Did you or are you planning on doing a CAI also?

So the GM exhaust stays hidden under the truck like stock vs Borla you get some chrome tips?

If you go touring, I'd be interested in how you find noise/drone from 60-90mph on the highway

 

[cardude2000]

Have you seen the inside of the stock muffler? The stock exhaust may be 3.5" but you can't even shine light through it. So with the Borla being 3" with a "free flow" muffler it kinda makes sense that the truck would breathe better. Yes the Magnaflow and Gibson come 3.5" but I'm not a fan of how they sound or look.

To each their own. Until I see something that actually proves there isn't power LOSS by going to a smaller pipe, I'm passing. They do sound nice though.


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[bottomline2000]

To each their own. Until I see something that actually proves there isn't power LOSS by going to a smaller pipe, I'm passing. They do sound nice though.


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[TechSupport]

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That exhaust is 30' long and that's a built motor.

 

[bottomline2000]

That exhaust is 30' long and that's a built motor.

What does it matter if it's built or not? Only the exhaust size changes..point was larger diameter pipe made more power.

Why would you want to downsize your factory pipe anyway? I'd love to have 3.5" exhaust on my truck. It needs it and I'm just cammed with headers.


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[TechSupport]

What does it matter if it's built or not? Only the exhaust size changes..point was larger diameter pipe made more power.

Why would you want to downsize your factory pipe anyway? I'd love to have 3.5" exhaust on my truck. It needs it and I'm just cammed with headers.


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I'm no engine builder, but that's a carbureted engine with jets tuned for open exhaust. They even said that it was running rich. I'm willing to bet if they tuned it for each exhaust they installed it would have made better power then what it did with just slapping an exhaust on.
At least with a fuel injected engine it will adjust it self for the intake and exhaust you install.

 

[2manycars4me]

The exhaust came in today. I will get it put on tomorrow morning and see how it does. I'll charge up the GO Pro and take some sound clips on the way to the shop and back with the exhaust. I agree with other people about the flow versus the size of the piping. If you restrict the mufflers you do the equivalent of downsizing the piping. I've had Corsa exhausts on a few other vehicles and there is noticeable improvement in vehicle performance with the less restrictive exhaust. I wonder if anyone has done flow tests with the different exhaust systems?

 

[cardude2000]

The exhaust came in today. I will get it put on tomorrow morning and see how it does. I'll charge up the GO Pro and take some sound clips on the way to the shop and back with the exhaust. I agree with other people about the flow versus the size of the piping. If you restrict the mufflers you do the equivalent of downsizing the piping. I've had Corsa exhausts on a few other vehicles and there is noticeable improvement in vehicle performance with the less restrictive exhaust. I wonder if anyone has done flow tests with the different exhaust systems?

I'd love to see a same day dyno done on it. I so badly want a new airbox and cat back but the frickin pipe size is a no go for me. Ugh.


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[RThomasII]

Just for my own clarification are we talking about the 6.2L Borla exhaust being 3" vs. 3.5" for the stock exhaust or is that for the 5.3L engine?

Checking the specs over on the Borla website shows the 5.3L Tahoe exhaust 2.75" into the muffler and 2.25" dual pipes to the tips. Those same measurements also apply to the pickup. I just got a recall notice in the mail for faulty airbags or some such nonsense and I was planning to have the CAI kit and the Borla exhaust from the GM accessories catalog installed at the same time as the recall work. More importantly, I can't seem to find any "claimed" performance gains associated with this exhaust at all. Does that mean that all I can expect is a better sounding truck?

 

[2manycars4me]

I'm not sure on the performance side how much you gain. The Borla I got was for the 6.2L. It sounds much better. I could hear the difference in the truck once I started it at the shop. The exhaust has a nice rumble to it now and when you hit it on the road there is a noticeable difference in the truck.

 

[cardude2000]

Just for my own clarification are we talking about the 6.2L Borla exhaust being 3" vs. 3.5" for the stock exhaust or is that for the 5.3L engine?

Checking the specs over on the Borla website shows the 5.3L Tahoe exhaust 2.75" into the muffler and 2.25" dual pipes to the tips. Those same measurements also apply to the pickup. I just got a recall notice in the mail for faulty airbags or some such nonsense and I was planning to have the CAI kit and the Borla exhaust from the GM accessories catalog installed at the same time as the recall work. More importantly, I can't seem to find any "claimed" performance gains associated with this exhaust at all. Does that mean that all I can expect is a better sounding truck?

The 6.2l kit for the Yukon is a 3" pipe. The factory exhaust is a 3.5". Some here have claimed it gives them more power, others claim it's noticeably reduced their power.

The Sierra kit does NOT shrink the pipe to 3", it keeps it at 3.5" all the way through.


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[NowZoomer]

I'm not sure on the performance side how much you gain. The Borla I got was for the 6.2L. It sounds much better. I could hear the difference in the truck once I started it at the shop. The exhaust has a nice rumble to it now and when you hit it on the road there is a noticeable difference in the truck.

No chance of before and after dyno runs? That would put to bed the argument of 3.5" OEM vs Borla 3"

 

[gdfein]

Can the 3.5" Borla for the 6.2 Sierra be used on the Yukon/Esky, and if yes would this be the swb or lwb SUV?


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