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Installed Borla/GM cat-back Exhaust System

jimlem

By jimlem
in Modifications & Accessories

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TheBigGrabowsky Enthusiast

TheBigGrabowsky

Posted
Posted

 

The newest version of this exhaust, does not use the bypass pipe only a valve inline in the exhaust. Just installed it today.

 

Are you saying the latest GM/Borla exhaust (not direct from Borla) no longer uses the 1" diameter bypass tube? And it still uses the factory looking flapper valve? Got any pics? How does it sound?

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krdeal Enthusiast

krdeal

Posted
Posted

I will try and get pictures tomorrow. Sound is quieter than I expected. I was looking for the quieter end of the scale.... Just quieter than even the you tube videos.

mafd2 Senior Enthusiast

mafd2

Posted
Posted

 

The newest version of this exhaust, does not use the bypass pipe only a valve inline in the exhaust. Just installed it today.

What size are the tail pipes o.d? 2.25"?

krdeal Enthusiast

krdeal

Posted
Posted

I need to crawl under the truck to take a picture of the valve assembly this weekend. I will measure them for you then. I think they are 2.5" or 2.75". Remember there are tips on the end that are bigger.

krdeal Enthusiast

krdeal

Posted
Posted

Nope, you were right. 2.25" after the muffler to the tips. I just checked the Borla Web site.

  • 4 weeks later...
mafd2 Senior Enthusiast

mafd2

Posted
Posted

Installed my new GM/Borla and very satisfied. Love the deep sound and no AFM V4 drone like my Gibson had. $$$$ but top quality. Mine has the bypass tube. I used my Gibson tips which are polished stainless, clamp less, and 2.25 X 4" outlet like the Borla tips.

sti Enthusiast

sti

Posted
Posted

Installed my new GM/Borla and very satisfied. Love the deep sound and no AFM V4 drone like my Gibson had. $$$$ but top quality. Mine has the bypass tube. I used my Gibson tips which are polished stainless, clamp less, and 2.25 X 4" outlet like the Borla tips.

Which Gibson did you have? I'm looking at them but don't want to have serious drone issues.

 

 

STI

mafd2 Senior Enthusiast

mafd2

Posted
Posted

Gibson 65657 dual rear exit stainless. It sounded great until the AFM kicked it. It was horrible! It was ok in quality but nothing compared to the Borla. The left side added hanger on the Gibson system was junk. Changed it to a better hanger and rubber isolator. It's amazing how the Borla with the flapper valve and tube makes so much difference. Money well spent.

oldbiker Enthusiast

oldbiker

Posted
Posted

Gibson 65657 dual rear exit stainless. It sounded great until the AFM kicked it. It was horrible! It was ok in quality but nothing compared to the Borla. The left side added hanger on the Gibson system was junk. Changed it to a better hanger and rubber isolator. It's amazing how the Borla with the flapper valve and tube makes so much difference. Money well spent.

mafd2, Did you clamp open your flapper valve on your GM/BORLA or left the flapper operate on its own? I was considering buying either a non gm borla or magnaflow because of the price, both don't have the flapper. But your saying the flapper valve makes that much difference in sound when AFM is activated, then i better think twice about buying the GM/BORLA. Anyone out there running the non gm borla or magnaflow that could comment on the sound when AFM is kicked in. I'm not going to deactivate the AFM, i plan on using that feature because it does help with fuel economy.

scrodd88 Enthusiast

scrodd88

Posted
Posted

I also went with the GM Borla Exhaust. Even though Borla won't confirm that the GM system uses their "Touring" muffler, that's probably what it is. They claim the muffler in the GM Borla system is "to GM Specifications" but probably is the regular Borla "Touring" model.

 

I am very happy with the system. For some, it might be a little on the tame side, but for me, it's just perfect. One thing you have to remember is that with the cabs of the new trucks being so quiet, the exhaust sound outside is quite a bit louder than you would think. I had my son drive my truck and I stood outside so I could hear the exhaust, and I was quite surprised as to how much sound there actually is. You wouldn't know I had a "performance exhaust" on the truck from the inside, until you get on the go pedal. Then it's a nice rumble as the RPM's increase. I have no drone at all, and no problem with the V4 "flutter / helicopter sound" etc. It's a perfect sound for me, a fair bit louder than "Stock" but not at all raspy or offensive.

 

The GM Borla system has an integrated adaptive exhaust valve, where as a system purchased directly through Borla, even though one for a GM truck, will not have this valve. It must be this valve that controls all the unwanted drone etc. The system is pricey, but it works. I was apprehensive when I first decided to go this way, as the price was similar to the OP's, but after having had the system on now for about 3 months, I don't regret the cost. The system gives me the sound I want, without any of the usual annoyances that are present with a lot of the other systems out there.

 

REV

 

A few pics of the GM Borla System, and the Borla adaptive valve, included with the system

Whats this part number or site to get this one?

mafd2 Senior Enthusiast

mafd2

Posted
Posted

Yes, the flapper (adaptive) valve make the difference. It gives you more low end power and torque by giving more back pressure when in V4 mode and cuts the "drone" helicopter sound. You need some back pressure and with a large diameter exhaust pipe, you do need back pressure in V4 mode. I've read where some members have tied their valve open on their factory system and gotten the dreaded drone sound. If you get drone on a factory system with a resonator just think what drone you'll have on a performance muffler with no resonator. The drone on my Gibson was terrible especially at highway cruising speeds and even in town. If you get any system without the valve, being Gibson, Magna Flow, Flowmaster etc. you won't be satisfied. They're cheaper but not worth the savings. A good muffler shop could cut the OEM pipe behind the valve then you could put your own custom exhaust on if this was the way you wanted to go. Member krdeal said his GM/Borla didn't come with the balance tube but had the valve on it but mine had the valve and balance tube.

chuckl1218 Senior Enthusiast

chuckl1218

Posted
Posted

ShopChevyParts.com shows the different models (Double Cab or Crew Cab, Short Bed, Regular Bed, side exit or rear exit) and tips. Then you can search Internet for them. Currently, they show the different models for $999.20 plus shipping and tips. I found mine at a dealer near New Orleans through eBay. Here's the link to ShopChevyParts for your reference...

http://www.shopchevyparts.com/all-new-silverado-1500/performance-c-26_2519_2520_2526.html

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