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Old 03-31-2011, 08:29 PM   #1
572HP
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Borla S Catback on SS L99 Convertible

Convertible SS L99 (Automatic).

I took two videos. One with stock air cleaner and stock exhaust, and one with Borla S Catback & CAI air induction. I'll post pics soon.

Stock exhaust.


Borla S Catback


This was the very first startup after installing the exhaust. That is why it is smoking so much. The pipes have some oil and other stuff in them from the manufacturing process.

I also have a LS3 that I put the Borla S catbacks on. I love the fit of this kit. This kit fits the convertible BETTER than the stock exhaust. There is absolutely NO issues with the new convertible bracing.

I'm going to weigh the stock exhaust, because I believe the Borla system is a huge weight savings. I did not weigh the Borla catback, so I'll have to look around to find the weight.

The stock exhaust was way too gentle for my taste. It reminded me of a little kitten. This system sounds very good. Very deep rumble, and gets pretty loud when you gun it.

Drone was pretty loud around 1200-1400 RPM. I don't think the drone is this loud in my coupe.

If you don't like it loud, I would recommend the Borla Touring Catback. I don't think many would like the louder ATAK. The "S" is plenty loud for me. Because the convertible top transmits sound so much better than the coupe, you can really hear the roar. This system might be too loud if used with high flow cats and headers.

Installed pics coming tomorrow.
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Old 03-31-2011, 09:30 PM   #2
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Thanks for the update. My borla is being delivered tomorrow.
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Old 03-31-2011, 09:59 PM   #3
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Quote:
Originally Posted by 572HP View Post
Convertible SS L99 (Automatic).

I took two videos. One with stock air cleaner and stock exhaust, and one with Borla S Catback & CAI air induction. I'll post pics soon.

Thanks for the update. Definitely like the deep growl and sound, however, would not be happy with the drone; especially in the Vert. Have a Solo "drone free J-pipe" system coming soon for an identical setup (CAI, inc and L99) and will post a comparison video as well.
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Old 03-31-2011, 10:28 PM   #4
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Borla S-Type on mine. The Touring (not enough), The Atak (Too much). The S-type (Just right). No probs on the install. However... the droaning sound is really amplified in the convertible at low rpm's. The best fix is turning of the AFM (Automatic Fuel management). I just had my vert custom tuned at "The Vette Doctors" here in Long Island and the first thing they did was turn that off. Major difference. Much smoother ride overall. Love it!
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Old 04-01-2011, 12:24 AM   #5
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572HP, how was the setup for you? Did you take it somewhere or do it yourself?
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Old 04-01-2011, 05:25 AM   #6
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I did it myself. The catback system is very easy to install. All is needed is ramps or jack stands, a screwdriver (for bending back the retention tabs on the stock exhaust connectors), 15mm deep socket and ratchet, some cold beer, dry ground, and about 1 hour. Have I said that the fit is perfect?

The most difficult part for me was getting the old system out. The stock exhaust should be able to drop straight down, and pulled from under the back side of the car. However, I used a 4-post car lift, which made it difficult to get out the stock exhaust, because the back end was not jacked up. I ended up cutting one of the garbage cans / pillows / mufflers off so I could get it out.
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Old 04-01-2011, 07:20 AM   #7
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I have the borla s on mine. I listened to every post I could find on mufflers and the borla s is what my ears liked best. I really like the way your borla's sound-congrats.
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Old 04-01-2011, 08:27 AM   #8
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I have the borla s on mine. I listened to every post I could find on mufflers and the borla s is what my ears liked best. I really like the way your borla's sound-congrats.
So...my wife and I are getting closer to picking up a Vert. I have been thinking about adding the Borla S..but hadn't even considered how it would sound in a coupe vs a vert. (I'm a dope.) So...with the ragtop..is the Borla S now.."overwhelming"?
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Old 04-01-2011, 08:45 AM   #9
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I would consider it "loud". It doesn't really bother me though. The wife has not been in it yet, so I don't know if it will have the wife acceptance factor. The drone is pretty loud. I don't know how much is added by the active fuel management on the automatic yet. I'm going to get that tuned out and then we'll see. I would love to be able to turn afm on and off. Maybe I need to buy a tuner.

I would love to hear the touring on the vert. It might be a very good middle.
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Old 04-01-2011, 12:32 PM   #10
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Quote:
Originally Posted by 572HP View Post
Convertible SS L99 (Automatic).

I took two videos. One with stock air cleaner and stock exhaust, and one with Borla S Catback & CAI air induction. I'll post pics soon.

Thank you for the before and after videos! End result sounds really, really good. Also looking forward to the pics coming soon on the entire build.
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Old 04-05-2011, 01:27 PM   #11
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phdjent - Did turning off the AFM eliminate the drone completely?
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Old 04-05-2011, 01:43 PM   #12
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phdjent - Did turning off the AFM eliminate the drone completely?
I have yet to get AFM turned off. However, I don't believe it will eliminate it totally. The reason that I say that is because if I'm on the interstate going up a slow incline in 6th gear, I can feel the car coming out of AFM at the beginning of the incline, but it still has pretty bad drone. Manually shifting (in M mode) down to 5th gear, causes the drone to go away.

I had my wife and two boys on the long road trip this weekend, and nobody complained. They all really like the sound of the car. However, after we got home, my wife and I both felt like we were subjected to loud noise for a long period of time. I was also trying to manage the drone the whole time.

I would love to try the touring model. But I don't think anyone is going to send me one.
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Old 04-05-2011, 10:19 PM   #13
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phdjent - Did turning off the AFM eliminate the drone completely?
Not completely, but a major help. I could also just be getting used to it. Everyone's ears hear things differently. I was just in my friend's mustang vert with his MagnaFlow Catback and his top up. Man... his sh..t was loud and annoying. Vibrated the whole car. Just made me happier with mine.

Mustangs.......ha
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Old 04-06-2011, 05:48 PM   #14
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phdjent - Did turning off the AFM eliminate the drone completely?
Talk to me about the drone. Are there any audios on Youtube that demonstrate what this is? What does it sound like? When does it happen? Is it only an issue with non-stock exhausts?

Still waiting on my yellow/black/black ordered in November, but will be considering exhaust modification.
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Old 04-06-2011, 10:31 PM   #15
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Talk to me about the drone. Are there any audios on Youtube that demonstrate what this is? What does it sound like? When does it happen? Is it only an issue with non-stock exhausts?

Still waiting on my yellow/black/black ordered in November, but will be considering exhaust modification.
This really only applies to the automatic up shifting to fast and the feeling of the cylinders shutting off with the AFM. I personally haven't driven the stock exhaust to compare it to. I had my Borla S-Type put on before I drove the car home from the dealership.

The best way to describe the droan is when the car is comfortably cruising (usually between 50 & 60 mph) and the automatic has up shifted to a higher gear. So that next gear is hovering around 1000 rpm's and the note of the exhaust is so low that it causes a vibrating almost ear clogging low end hum. (The Droan)

I can say that after I had the car tuned, the difference was major. I drove the car all day today with the top up half the time and down the other half. Either I'm totally used to the sound or the more I break the car in the better it's been performing. It's getting smoother and quicker and I absolutely love my exhaust. I still think the car up shifts too early. Time will tell the more miles I put on the car.

This is the borla video on youtube that explains the differences in the sounds of their 3 types of exhausts. At 4:31 into the video is where you can hear the inside cabin noise of the s-type. You can clearly hear that the sound is much more deep and throaty but he's driving a manual and riding his gears much higher. If you can catch the start of the sound you hear right when he up shifts before he keeps accelerating, that's kinda the note that becomes the droanning sound while just cruising along. I can try to make a video of what my car sound like from the inside. Let me see what I can do.
This is Borla's link:
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Old 04-07-2011, 07:23 PM   #16
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One last question, which I should have included with the others: is droan then more an issue with automatics than manual transmissions? can it be controlled in manuals by varying either engine speed or gear?
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Old 04-07-2011, 09:16 PM   #17
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I have the same exhaust on both my manual and my automatic. Droan is resonance, and size of the cabin, frequency of the sound, as well as amplitude, all contribute to drone. The louder the exhaust, the louder the drone will be. For my convertible, the drone is most notable between 1200 and 1500 rpm. If I'm coasting, I don't notice it, because the exhaust is not very loud. If I give it a little gas, as in going up a slow incline, the exhaust gets louder, and the drone gets louder. Theoretically, manuals should have the same drone as automatics, but I would guess people drive with manuals at a little higher rpm. Once my rpm gets above 1800, all the drone is gone. Like I said earlier, you can get rid of the drone on the highway, by shifting down into 5th. However, this will hurt your gas mileage.
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Old 05-03-2011, 07:39 PM   #18
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what is the website to get this exact exhaust system?
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Old 05-03-2011, 08:22 PM   #19
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Hey 572-

When you did the uninstall/install, how far did you unbolt the angled rear "V" braces that go.from the trunk to the frame? When I tried mine, I only unbolted the very rear section as the center bolts (by the rear wheels) had a lot of tension on them- I was afraid somethig may shift if I removed them that I wouldn't be able to remount...therefore I struggled like crazy to remove the rear section (and evennworse re-installing it when mine didn't fit, lol)

Were you able to.remove then entire brace without any problems?

Thanks!
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Old 05-03-2011, 08:24 PM   #20
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And PS- Congrats on car of the week!
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Old 05-03-2011, 08:35 PM   #21
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I would love to try the touring model.

I am leaning towards the touring. I want something a little deeper and louder than stock but not too loud. I would rather stay stock than be in something that is obnoxious.

I would really love to hear one installed on an LS3 vert. Also I have been told that the GM Performance exhaust is in fact the Borla Touring. Any truth to that?
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Old 05-04-2011, 05:27 AM   #22
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Hey 572-

When you did the uninstall/install, how far did you unbolt the angled rear "V" braces that go.from the trunk to the frame? When I tried mine, I only unbolted the very rear section as the center bolts (by the rear wheels) had a lot of tension on them- I was afraid somethig may shift if I removed them that I wouldn't be able to remount...therefore I struggled like crazy to remove the rear section (and evennworse re-installing it when mine didn't fit, lol)

Were you able to.remove then entire brace without any problems?

Thanks!
There was no tension on the braces. The bolts came right out, and lined right back up. Are you saying that you have side-to-side tension? If so, I don't think that is right. I can see a little up and down tension since there are 3 mounting locations. Loosen all of the bolts and see if the tension is gone. The bolts are pretty long.

Did you decide on an exhaust? If so, what?
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Old 05-04-2011, 05:32 AM   #23
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what is the website to get this exact exhaust system?
From a couple of our camaro5.com sponsors:
http://www.apex-speed.com/borla-stai...pe-140280.html

http://marylandspeed.com/borla-stype...80-p-2366.html

Check your vendor of choice for package deals. Sometimes they offer a deal with an air intake or something like that.
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Old 05-04-2011, 05:38 AM   #24
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I am leaning towards the touring. I want something a little deeper and louder than stock but not too loud. I would rather stay stock than be in something that is obnoxious.

I would really love to hear one installed on an LS3 vert. Also I have been told that the GM Performance exhaust is in fact the Borla Touring. Any truth to that?
I have always heard that the GM Performance one was based on / made by Corsa. I don't know how to confirm though. The touring should be quiet, but with a deep throaty sound, and get pretty loud when you stomp on the gas. The sound should be no different on the outside between a coupe and a convertible. Same LS3 engine.
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Old 05-06-2011, 03:39 PM   #25
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There was no tension on the braces. The bolts came right out, and lined right back up. Are you saying that you have side-to-side tension? If so, I don't think that is right. I can see a little up and down tension since there are 3 mounting locations. Loosen all of the bolts and see if the tension is gone. The bolts are pretty long.

Did you decide on an exhaust? If so, what?
When.I tried my install, I first removed the rearmost center bolts with very little resistance, when I went to the center bolts on the same braces, they were dramatically tighter... may be nothing to it, but I was nervous to take them off and not get them back on! Now that the verts have been out awhile, and im not the first to experiment, i'll be less hesitant. Thanks!

Im still holding out for the Flow Master ATs... shouldn't be much longer! I've also got a deal coming on a set of long tubes that are coming off a performance shops car to convert to a turbo, got a little wait till I can swap those out, and id.rather do it all at once.
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