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

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Old 01-18-2012, 11:35 PM   #1
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Corsa / Solo Exhaust for L99 AFM question

I think I've finally narrowed it down to the Corsa Catback or the Solo Mach XL w/J pipes for the L99. Not sure whether or not to go with the axle back or catback on the Mach XL.

Can someone with these exhausts on an otherwise stock engine L99 advise me on what the AFM kicking in sounds like with these? Is it very noticeable? Can you also advise on how it sounds in 4 cylinder mode? There seem to be no videos out there of that.

I'm looking for a no drone exhaust, and not a huge fan of popping noises either. How's the popping on these 3 setups for the L99?

No plans to tune out the AFM right now as I want to keep my warranty intact.

Thanks!
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Old 01-19-2012, 06:32 PM   #2
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In my opinion the AFM is terrible on any exhaust but if I had to deal with it I would get one of these two systems. As far as which one is better.....they are pretty close but without driving in both back to back it would be real hard to judge. Go with the one that sounds better to you.
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Old 01-19-2012, 08:17 PM   #3
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I like my Corsa exhaust. I could hear the AFM kick in at low cruising speeds while going through my neighborhood. Never heard the AFM on the highway. Last year I had the AFM removed while getting a cam package installed and glad I did it.
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Old 01-19-2012, 08:23 PM   #4
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I don't know if you have headers, but my decel popping is LOUD. I see people in other cars turning their heads to see what is happening when I decel. Of course, with the M6, I can always shift to neutral to decel should I ever tire of the pop (not any time soon ). I'm sure it's not see easy with the A6.
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Old 01-19-2012, 08:24 PM   #5
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Both are good choices... if you notice 4 cyl mode now it will be slightly accentuated with either of these Catbacks, but not that bad IMO.

Seems the folks who are bothered by AFM are bothered by it stock also. That might be your best guide.. if it doesn't bother you now you will be OK with either of these systems. Especially since you are not going to tune which also means no headers.
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Old 01-19-2012, 08:40 PM   #6
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Quote:
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I don't know if you have headers, but my decel popping is LOUD. I see people in other cars turning their heads to see what is happening when I decel. Of course, with the M6, I can always shift to neutral to decel should I ever tire of the pop (not any time soon ). I'm sure it's not see easy with the A6.
Automtic cars don't decel like manual cars left in gear so it's usually not that big of a deal. The biggest cause for popping in your exhaust is headers especially with out cats.
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Old 01-20-2012, 10:48 AM   #7
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Thanks guys for the feedback. I don't notice AFM at all right now stock. I have no headers or plan on getting them. Contemplating getting a supercharger some day.

I've heard it mentioned that there are ways to avoid AFM kicking in - like shifting the transmission into M mode - or tapshifting. Is that true? I always drive in M - don't tapshift as much though.
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Old 01-20-2012, 11:18 AM   #8
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Originally Posted by stros View Post
Thanks guys for the feedback. I don't notice AFM at all right now stock. I have no headers or plan on getting them. Contemplating getting a supercharger some day.

I've heard it mentioned that there are ways to avoid AFM kicking in - like shifting the transmission into M mode - or tapshifting. Is that true? I always drive in M - don't tapshift as much though.
Tapshift is a waste IMHO... it's fun for occasional drives but does nothing for performance... Driving in M is the ticket like you already do. As I said earlier if it doesn't bother you now, you will be fine with either of these systems. Once you ever do decide to go headers or SC you will be tuning anyway and would just turn it off at that point.
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Old 01-20-2012, 12:43 PM   #9
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mlee is right. You get better performance driving in sport mode. If you want to cut the AFM off you have to tapshift to 6th gear and then down shift to 5th then back to 6th. The AFM will be off until you shift back to Drive or Sport mode. That how I cut the AFM off on long road trips.
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Old 01-20-2012, 01:09 PM   #10
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Cool. Thanks. Sounds like there are some ways around AFM if I find it annoying.

Last question - if i go with Solo - any major reason to spend the money on the catback instead of the axle back?

I think I'm leaning towards Solo as it supposedly has a deeper muscle car tone to it.
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Old 01-20-2012, 01:42 PM   #11
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The Catback is really nice if it's not too pricey for you. The added custom resonated X pipe will smooth the tone out and cut down on the popping of the axle back version. Will replace the whole large auto resonator you have.
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Old 01-20-2012, 10:39 PM   #12
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It may not bother you to have the AFM system operating but if you ever drove your L99 with it turned off you would NEVER want it back on. I was worried a bit about warrantee at first but decided to get a custom tune with some bolt ons and turned the AFM off. Never looked back and could not be happier.

A good tune will get you the same milage or better with the AFM turned off then the stock tune will get you using the AFM system.

Again, if you ever drove your car with it turned off you would never consider putting up with it again.
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Old 01-23-2012, 06:17 PM   #13
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Made my decision - just ordered the Solo Mach XL with J Pipes from Juiced Motorsports (thanks Jason @ Juiced for answering my numerous questions).

Getting it installed by the guys at Blu808 here in San Jose once it arrives. Hoping that the AFM doesn't bug me at all as I don't want to risk voiding that 7 year extended warranty I got a good deal on back when I got my SS in 2009 by tuning it:-)
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Old 01-23-2012, 07:14 PM   #14
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Quote:
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Made my decision - just ordered the Solo Mach XL with J Pipes from Juiced Motorsports (thanks Jason @ Juiced for answering my numerous questions).

Getting it installed by the guys at Blu808 here in San Jose once it arrives. Hoping that the AFM doesn't bug me at all as I don't want to risk voiding that 7 year extended warranty I got a good deal on back when I got my SS in 2009 by tuning it:-)
Great choice! Jason's a good guy, very helpful with all of my questions as well - highly recommended! Enjoy...
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Old 01-23-2012, 07:36 PM   #15
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Both are good choices... if you notice 4 cyl mode now it will be slightly accentuated with either of these Catbacks, but not that bad IMO.

Seems the folks who are bothered by AFM are bothered by it stock also. That might be your best guide.. if it doesn't bother you now you will be OK with either of these systems. Especially since you are not going to tune which also means no headers.

you definitely notice it mufflerless... it didn't bother me at ALL when I had the stock exhaust, it was terrible with the X-pipe/Pype's Bomb(mufflerless) axleback

so much that a tune I think is a MUST with this setup on a L99... I absolutely love the exhaust note, even on the stock tune when it was in 8 cylinder mode... the tune took care of all ill effects of an exhaust on a L99, it really doesn't drone bad, I can be on the highway doing 70, with the radio down and carry on a conversation easily
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Old 01-31-2012, 04:59 PM   #16
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Quote:
Originally Posted by stros View Post
Made my decision - just ordered the Solo Mach XL with J Pipes from Juiced Motorsports (thanks Jason @ Juiced for answering my numerous questions).

Getting it installed by the guys at Blu808 here in San Jose once it arrives. Hoping that the AFM doesn't bug me at all as I don't want to risk voiding that 7 year extended warranty I got a good deal on back when I got my SS in 2009 by tuning it:-)
Let me know how you like it. I'm thinking of doing the same thing. Corsa is nice, but an S-load of money.
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Old 01-31-2012, 06:53 PM   #17
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Will do...getting it installed on Thursday morning.


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Let me know how you like it. I'm thinking of doing the same thing. Corsa is nice, but an S-load of money.
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Old 01-31-2012, 07:03 PM   #18
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you definitely notice it mufflerless... it didn't bother me at ALL when I had the stock exhaust, it was terrible with the X-pipe/Pype's Bomb(mufflerless) axleback

so much that a tune I think is a MUST with this setup on a L99... I absolutely love the exhaust note, even on the stock tune when it was in 8 cylinder mode... the tune took care of all ill effects of an exhaust on a L99, it really doesn't drone bad, I can be on the highway doing 70, with the radio down and carry on a conversation easily
I definitely wasn't talking about mufflerless... but you are right turn it off is a must then..
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Old 01-31-2012, 09:57 PM   #19
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Will do...getting it installed on Thursday morning.
Awesome. Good luck and post a vid if you can. I don't want to have to tune out AFM either, so from what I've read, it looks like I have to go Solo or Corsa.
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Old 01-31-2012, 11:34 PM   #20
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Are there any vids of AFM kicking in from inside the cabin? Outside?? I so wanna hear what it sounds like with an exhaust.
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Old 01-31-2012, 11:40 PM   #21
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Corsa! Been very happy.
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Old 02-01-2012, 12:25 AM   #22
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i have the solo im very happy! true muscle car sound!
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Old 02-01-2012, 12:26 AM   #23
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I WOULD TUNE OUT THE AFM. all exhausts sound bad going in and out of 4 and 8 cylinders
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Old 02-01-2012, 02:22 AM   #24
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mlee is right. You get better performance driving in sport mode. If you want to cut the AFM off you have to tapshift to 6th gear and then down shift to 5th then back to 6th. The AFM will be off until you shift back to Drive or Sport mode. That how I cut the AFM off on long road trips.
So are you saying that as soon as I pull out of the drive way to tapshift all the way up to 6th, back to 5th, then backup to 5th? Even though I may need to start out in 1st or 2nd gear? My understanding is that as long as the car is in Sports Mode, AFM is turned off.

I myself don't notice AFM kicking in or out either as far as noise with the exhaust. I can feel the hesitation plus feeling the transmission kicking down a gear or two, but as for as exhaust sound I don't hear it. I have been using Sports Mode all the time and then I don't feel AFM at all.
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Old 02-01-2012, 02:32 AM   #25
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So are you saying that as soon as I pull out of the drive way to tapshift all the way up to 6th, back to 5th, then backup to 5th? Even though I may need to start out in 1st or 2nd gear? My understanding is that as long as the car is in Sports Mode, AFM is turned off.

I myself don't notice AFM kicking in or out either as far as noise with the exhaust. I can feel the hesitation plus feeling the transmission kicking down a gear or two, but as for as exhaust sound I don't hear it. I have been using Sports Mode all the time and then I don't feel AFM at all.
If you are not hearing the exhaust noise and it doesn't bother you then why try and kill AFM and lose a couple extra MPG. AFM is definitely on in sport mode also. But some claim they can turn it off by going manual and shifting down to 5th and then back up to 6th. Sounds like AFM is working well for your setup...
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