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Exhaust looks nice.
And about the AFM.
I have the GMPP off road axle back and I also hear the AMF kick in and out (and I'm still running the resonators)
The stock L99 mufflers are different from the LS3 mufflers. I'm sure they were designed to eliminate the AFM noise. But they're quite restrictive in design.
I think the exhaust companies that are making catbacks for the L99 might want to look at ways to eliminate of decrease the noise from AFM.
I'm afraid of having a full exhaust (headers, high flow cats, and catback) while retaining the AMF cababilities. It would have to make some annoying sounds when the AFM cuts in and out.
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