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Installed Borla/GM cat-back Exhaust System

jimlem

By jimlem
in Modifications & Accessories

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russ9443 Enthusiast

russ9443

Posted
Posted

 

Russ.......how does your system sound. Do you have any V4 sound issues or droning? Looks pretty much like the GM Borla system except for the pipe sizes, where yours seem to be a little larger diameter. Mostly are you happy with it, after all, that's all that counts?

 

REV

So far I am happy. I plan to update the pinned exhaust thread after a bit, I posted a couple videos there. I just ran 3 tanks of gas through to check MPG, make sure I didn't F that up. Now I am running it with the valve open to compare sound and again MPG. Defiantly more drone/helicopter sound with it open, especially when cold. My commute has some slight incline as to where I am in V4 but under some load, that's where I notice the benefit of the valve the most.

 

I have a tune so I may try valve open and V8 only, check mpg and then decide what to keep.

 

I am concerned a little about that bypass size. May try changing that if it's easy. Cost about $30 to add it, I got the 3in valve for free.

 

 

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revitupfaster Enthusiast

revitupfaster

Posted
Posted

So far I am happy. I plan to update the pinned exhaust thread after a bit, I posted a couple videos there. I just ran 3 tanks of gas through to check MPG, make sure I didn't F that up. Now I am running it with the valve open to compare sound and again MPG. Defiantly more drone/helicopter sound with it open, especially when cold. My commute has some slight incline as to where I am in V4 but under some load, that's where I notice the benefit of the valve the most.

 

I have a tune so I may try valve open and V8 only, check mpg and then decide what to keep.

 

I am concerned a little about that bypass size. May try changing that if it's easy. Cost about $30 to add it, I got the 3in valve for free.

 

 

Sent from my iPhone using Tapatalk

 

Good Luck Russ......I hope you find the right combination. I know my GM Borla system works great. Absolutely no drone at any speed, and just a very very slight "Helicopter" V4 sound at certain RPM's. I know what I'm listening for with the V4 thing as I has a 2007, with the same issues, but if you really don't know what you are listening for, you wouldn't even notice it. It's almost imperceptible.

 

I wonder if it makes any difference that the GM Borla adaptive valve is before the muffler, where as yours is in the "stock" position directly behind the muffler. Who knows, there are just so many potential areas where adjustments can be made, and you really don't know if it will have any effect on the overall end result.

 

REV

russ9443 Enthusiast

russ9443

Posted
Posted

 

very very slight "Helicopter" V4 sound at certain RPM's

 

No drone with my setup either and the slight helicopter I would say I have that as well. Sometimes at around 1700 RPM I can hear it with the radio off. I thought maybe the GM Borla didn't have that.

revitupfaster Enthusiast

revitupfaster

Posted
Posted

 

No drone with my setup either and the slight helicopter I would say I have that as well. Sometimes at around 1700 RPM I can hear it with the radio off. I thought maybe the GM Borla didn't have that.

 

Yes I have it, but as I said, unless you knew what you were listening for, you wouldn't even notice it, I just know it's there because of my last truck, a 2007 Silverado, where I had a Magnaflow muffler, and the V4 transition sound was very pronounced. It must be that valve that is helping control the unwanted sound issues.

 

REV

  • 2 weeks later...
Green 1364 Enthusiast

Green 1364

Posted
Posted

Guy's to be clear....if I want no drone do I go with the GM/BORLA? Or is it the same as the one I buy from Borla.com. I'm trying to decide between the GM/Borla or the Borla I can buy from Borla. The non GM Borla is a few hundred cheaper.

chuckl1218 Senior Enthusiast

chuckl1218

Posted
Posted

Guy's to be clear....if I want no drone do I go with the GM/BORLA? Or is it the same as the one I buy from Borla.com. I'm trying to decide between the GM/Borla or the Borla I can buy from Borla. The non GM Borla is a few hundred cheaper.

To be clear...buy the GM/BORLA if you do NOT want drone.

boone9 Enthusiast

boone9

Posted
Posted

Does anybody have the Borla sport cat back non gm? And is it possible to get the valve put it if there is a drone? I have a 14" magna flow cat back on my 2008 chevy and there was a pretty loud drone in v4. I want to get away from that but would really like the borla sport and my understanding is the gm borla doesn't have that option. What do you guys think?

revitupfaster Enthusiast

revitupfaster

Posted
Posted

Guy's to be clear....if I want no drone do I go with the GM/BORLA? Or is it the same as the one I buy from Borla.com. I'm trying to decide between the GM/Borla or the Borla I can buy from Borla. The non GM Borla is a few hundred cheaper.

 

Definitely get the GM Borla. There was a thread somewhere here where someone had installed the regular "Borla" system, and he actually called Borla because of the drone and I assume the "Helicopter" sound. Someone also tried to order only the Borla headpipe which has the adaptive valve in it, and Borla wouldn't/couldn't sell it to him, as apparently it was a GM part, and could not be sold individually.

 

I don't know what the end result would be by adding the valve to a regular Borla system, but unless uou have the valve and the ability toe weld it in, by the time you pay someone to do it, you probably will pretty much eat up the $200 savings. I know there was a fellow doing exactly this, but I have not seen him post any results of the final outcome.

 

 

REV

Chief Bob Enthusiast

Chief Bob

Posted
Posted

I have the GM/BORLA and I have zero drone. It is slightly louder than stock, but has a nice non obnoxious growl. It is comparable to the Hemi Ram exhaust. It sounds Fking awesome in other words! I am very happy with it.

russ9443 Enthusiast

russ9443

Posted
Posted

 

I know there was a fellow doing exactly this, but I have not seen him post any results of the final outcome.

 

 

REV

I am still testing it out. Just ran my first tank of gas with the flapper valve stuck open to check MPG. Got 1MPG better on this tank and I am liking the sound which I thought I wouldn't. I think the bypass they put on is too big, too much flow is going that route, which isn't the most efficient. So still trying to decide if I try a smaller bypass, if the 1MPG better was just a fluke, or if I just leave the valve open.

revitupfaster Enthusiast

revitupfaster

Posted
Posted

I have the GM/BORLA and I have zero drone. It is slightly louder than stock, but has a nice non obnoxious growl. It is comparable to the Hemi Ram exhaust. It sounds Fking awesome in other words! I am very happy with it.

 

Exactly my feelings "Chief Bob".

 

REV

  • 9 months later...
Slamminv Enthusiast

Slamminv

Posted
Posted

Does this system allow you to go back to stock if wanted or do you have to hack up the pipes

krdeal Enthusiast

krdeal

Posted
Posted

I had this installed today. You do not need to cut the original system off, but some shops will because they think its faster.

krdeal Enthusiast

krdeal

Posted
Posted

I am still testing it out. Just ran my first tank of gas with the flapper valve stuck open to check MPG. Got 1MPG better on this tank and I am liking the sound which I thought I wouldn't. I think the bypass they put on is too big, too much flow is going that route, which isn't the most efficient. So still trying to decide if I try a smaller bypass, if the 1MPG better was just a fluke, or if I just leave the valve open.

 

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

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