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whats the best exhaust for engines with the AFM?

This is a discussion on whats the best exhaust for engines with the AFM? within the Exhaust forums, part of the Performance category; Okay so I would like to get a decent exhaust set up for my 2012 Silverado, what catbacks have you ...

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    Registered User smokinsilverado's Avatar
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    whats the best exhaust for engines with the AFM?


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    Okay so I would like to get a decent exhaust set up for my 2012 Silverado, what catbacks have you guys found that sound good when it goes into 4 cylinder mode and doesn't have a negative impact on gas mileage? Thanks for the imput.

    ****SOLD****05 Silverado 5.3, Whipple , Nelson tune, JBA Shorties, 80mm BBK Throttle Body, 6" Tuff Country lift, Toyo MT's 35's rolling on 20" MHT Fuel Hostage Wheels, Eclipse Avn62D Navi with 2 small 8's

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    Registered User HoosierZ's Avatar
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    Re: whats the best exhaust for engines with the AFM?

    I put a Magnaflow muffler on my '08 with the stock pipes. Inside the truck, I can't tell any difference between 8 & 4 cyl. It has a slight drone around 2000 rpm but I quickly got used to it. The mileage hasn't changed a bit.

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    Registered User smokinsilverado's Avatar
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    Re: whats the best exhaust for engines with the AFM?

    Okay perfect, so how do you like the sound?

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    Registered User HoosierZ's Avatar
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    Re: whats the best exhaust for engines with the AFM?

    I really like it. It has a deep mellow sound. I went with the longest 3" muffler they make.

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    Respect the Bowtie. BigBlue'00's Avatar
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    Another option is to have AFM tuned out. I had this done, cut out the factory muffler and resonator, and currently run a single chamber muffler with the pipe dumped next to the spare. G'luck w/ whatever you choose.
    Last edited by BigBlue'00; 08-08-2012 at 04:50 AM.

    2007 Silverado Crew Cab V-Max, Black Bear Performance Tune, Volant, Single Chamber Flow, CCM 2.5", Zone 1.5" BL, Eagle Alloy 178, Pro Comp Xtreme M/T's

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    Registered User uneverknow's Avatar
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    Re: whats the best exhaust for engines with the AFM?

    do you have any sound clips? i'm thinking of doing this to my burb what muffler # did you get?

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    They're coming for us 1988 GMC 355's Avatar
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    Re: whats the best exhaust for engines with the AFM?

    I would agree the Magnaflows would sound great in either mode, help MPG more, and get some performance, I would think the longest they make in a 3" inlet is 24" or so.

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