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Old 05-14-2010, 12:10 PM   #1
JoshJ81
 
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Flowmaster American Thunder CB L99

Does anyone have this system for their L99? I see in the picture at flowmaster.com that they have removed the resonator section and it is just straight pipes. So this leads me to believe they have not taken into account of the AFM droning when turned on.

Is there any Flowmaster guys here that has more information about the L99 system. I really like the sound but I can't handle the drone (I have previous experience with another system and put the stock back on). I'm thinking the best case is to just get an Axle back system only. Thoughts or videos from people that have the American Thunder (409S?) on their L99 would be grateful.

PS, Trust me I know what you are all thinking and yes I'm blaming my wife, a tune is out of the question. LOL
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Old 05-14-2010, 01:28 PM   #2
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I plan on going with this same system and a local performance shop here is going to delete AFM with HP Tuners for about $75. That will solve the problem and no affect on tune. However, I'm not sure if the AFM delete for void the GM warranty!!!!!!
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Old 05-14-2010, 02:14 PM   #3
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I think Bigtex686 had it untuned for a while and it wasn't horrible. Too quiet for my taste but not bad now that he has a cam, LTs and a tune.
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Old 05-14-2010, 02:17 PM   #4
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Quote:
Originally Posted by TexasTechZ06 View Post
I plan on going with this same system and a local performance shop here is going to delete AFM with HP Tuners for about $75. That will solve the problem and no affect on tune. However, I'm not sure if the AFM delete for void the GM warranty!!!!!!

Any modification to the stock computer tune = void powertrain warranty IF they catch it. Just the fact that the stock settings have been changed (no matter what the change may be, i.e., AFM, rev limiter, CAGS or skip-shift removal, etc.) = void powertrain warranty IF they catch it. It's all about risk/reward.
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Old 05-14-2010, 03:22 PM   #5
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Flowmaster American Thunder CB L99

I have just installed the Flowmaster American Thunder Kit 817481 on my L99 and really love the sound. I did not notice alot of drone in the car at all. I did notice in Sport Mode when paddle shifting from 6th down to 5th there was a little drone but once I got back on the gas all it was fine.
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Old 05-14-2010, 03:23 PM   #6
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nice
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Old 05-14-2010, 04:08 PM   #7
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Mine is the LS3 with the FlowMaster, and in 6th running at 65 I get drone. It really doesn't get on your nerves at all, just up the volume on the tunes and all is good. IMO the deep tone is worth the little bit of drone at certain speeds, just avoid the speed where you get it.
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Old 05-14-2010, 05:10 PM   #8
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Installed it today love the sound, so far it seems the drone noise is when the AFM kicks in. If you shift with the paddles you can keep it from kicking in with RPM's.


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Old 05-14-2010, 06:37 PM   #9
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Originally Posted by Robert91RS View Post
I think Bigtex686 had it untuned for a while and it wasn't horrible. Too quiet for my taste but not bad now that he has a cam, LTs and a tune.
I would love to hear what that sounds like ...... I bet it sound nice.
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Old 05-14-2010, 07:10 PM   #10
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Anyone got updated video? Ive seen enough the repeated ones on YT and would like some new material to get me to pull the trigger even sooner to put on my LS3..
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Old 05-14-2010, 08:54 PM   #11
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Wish I could help, but I tuned out my AFM before I installed my Flowmaster catback.
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Old 05-14-2010, 09:12 PM   #12
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I have noweed diverters and I deff had to turn off the afm
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Old 05-15-2010, 12:59 PM   #13
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Does anyone know what muffler series come with the Camaro SS V8 American Thunder Exhaust Kit?
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Old 05-15-2010, 01:12 PM   #14
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I need to hear more video sound clips of the American Thunder Flowmasters with & without different headers before I make up my mind.

The like 1 and only video clip around with Headers has that 40 series ping sound that I love so much..... Wonder if it was just a fluke

Plzzzz who ever has them installed take some video clips of drive by, idle, reving and launches
Every video i watch they have a slightly different tone
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