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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 05-13-2010, 09:24 PM   #1
Tillyhawk19
 
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Question What companies make a catback for AFM L99?

Who all makes a catback system for the L99 A6? i heard the afm was bad ? thanks
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Old 05-13-2010, 09:34 PM   #2
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I think Magnaflow has a system for it, and I'm sure there are others; they leave my mind right now though (stupid whiskey...).

It's said the transitions in AFM can make some unpleasant in-cabin noise, but I'm sure that's subjective, and also why the OEM exhaust is so conservative. I recommend having a look at the Sticky of exhaust clips, found in this Section (and also featured on the Home Page) for some samples. They don't do the cars justice, opposed to real life, but they might give you and idea. Also, do some searching and perhaps reach out to guys in your area whom might give you a sample of what they have on their cars.

Good luck.
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Old 05-13-2010, 09:38 PM   #3
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because the stock exhaust is so restrictive on the l99 wouldn't that result in a gain of hp. unlike the ls3 with no gain because their exhaust is pretty much free-flowing?
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Old 05-13-2010, 09:42 PM   #4
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ok thanks ! ill look into them ! i love there comp series
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Old 05-13-2010, 09:49 PM   #5
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Trick question??

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Old 05-14-2010, 06:33 AM   #6
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Quote:
Originally Posted by Tillyhawk19 View Post
Who all makes a catback system for the L99 A6? i heard the afm was bad ? thanks
good question. better question... who makes the BEST catback system for the L99 for someone that doesn't want AFM turned off??
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Old 05-14-2010, 07:08 AM   #7
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good question. better question... who makes the BEST catback system for the L99 for someone that doesn't want AFM turned off??
Good question.. not sure there is a good answer. Any catback will provide the AFM issue.

I thought I wouldn't want AFM turned off.. I though "Pffftt.. I can live with that". WRONG!!!! Tuner will be ordered this weekend.
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Old 05-14-2010, 09:56 AM   #8
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How do you turn it off ?
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Old 05-14-2010, 12:32 PM   #9
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You will need to get a handheld tuner to do it yourself, or go to a speed shop.

GM so thoughtfully reasoned we would completly love AFM, they didn't provide a switch, toggle, or any friendly way to turn it off. It will void your powertrain warrenty also. (At least your engine)

Worst thing about the new Camaro........AFM
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Old 05-14-2010, 12:52 PM   #10
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Eh, I got cherry bomb cat back great sound relatively cheap. There's drone when AFM kicks on but nothing the tunring the radio up a little won't take care of.

Last edited by bigsquirrel; 05-14-2010 at 12:52 PM. Reason: gramamr
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Old 05-14-2010, 11:13 PM   #11
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Eh, I got cherry bomb cat back great sound relatively cheap. There's drone when AFM kicks on but nothing the tunring the radio up a little won't take care of.
I have the Cherry Bomb exhaust and I haven't had a problem with the AFM. The exhaust sounds great all the time.

If you drive your car the right way, you'll never notice AFM because it won't kick in.
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Old 05-15-2010, 02:00 AM   #12
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Eh, I got cherry bomb cat back great sound relatively cheap. There's drone when AFM kicks on but nothing the tunring the radio up a little won't take care of.


lol...
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Old 05-15-2010, 05:51 AM   #13
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Ill be putting a MBRP cat back on in a few hours and let ya know how the AFM affects it
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Old 05-15-2010, 11:28 AM   #14
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Is there a difference between L99 stock exhaust and LS3 stock exhaust?

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Originally Posted by trudawg660 View Post
because the stock exhaust is so restrictive on the l99 wouldn't that result in a gain of hp. unlike the ls3 with no gain because their exhaust is pretty much free-flowing?
I didn't know there was a difference between L99 stock exhaust and LS3 stock exhaust. Is there ?
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Old 05-15-2010, 12:54 PM   #15
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Ill be putting a MBRP cat back on in a few hours and let ya know how the AFM affects it
The MBRP S7024304 is designed for the LS99 and I can confirm there is no drone at all. I couldnt hear it kick in and only once did i think it did. So if you like the deep sound of the MBRP you will be safe putting it on an A6
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Old 05-15-2010, 05:58 PM   #16
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I am pretty happy with my MBRP set. There is some drone when AFM kicks in when the engine is under more load than normal, like with a strong head wind, or going over an overpass. At first start up seems bad too, even the rear view mirror will vibrate. Other than that it is pretty good. I have JBA shorties and RotoFab CAI, so it is a bit louder anyway.
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