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Thread: Magnaflows on a 2003 Deville

  1. #1
    97DevilleConcours is offline Cadillac Owners Member
    Automobile(s): 2003 Deville LD8, 2007 STS V8 AWD
    Join Date
    Apr 2012
    Toronto, Canada

    Magnaflows on a 2003 Deville

    I put Magnaflow Mufflers(don't know model) on my 2003 Deville Base about 2 months ago. The car has 268,000KM, and this is my first mod from stock. I can say it does have a little bit more power but only at the very end of the RPM band.

    It only has more growl when I step on it, and has absolutely no drone while cruising which I love. It also saves me about 2 Liters per/100 KM. The mileage improvement might of happened no matter what replacement mufflers I put on, simply because of the high mileage on the stock mufflers, but I'm no car expert.

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  3. #2
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
    Automobile(s): 14 SRX, 00 SLS, 99 Deville 50-year Anniversary
    Join Date
    Mar 2009
    Dallas, TX

    Re: Would Magnaflows help MPG?

    Exhaust work on these cars are usually for sound, especially the end muffler work.


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