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Does high flow cats=louder?

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  • Does high flow cats=louder?

    I searched the forums, it has already probably been answered but I couldnt find it. Will a high flow cat make my exhaust louder, or just give me more power over stock?

    If louder, how much louder compared to just dumping them and running a pipe through the center?

    2002 GMC Sierra SLE Z71 ext.cab 5.3L---Single 3" flowmaster 40 dumped, Spectre CAI, LT headers and ORY, Wheatley tune, Mid 15's

  • #2
    Re: Does high flow cats=louder?

    pipe through the center would be louder. but the cat you have on your truck is a piece from the factory so a high flow one would be a lot louder or should be.
    body lift. 35" MTZ's on 16-10's GK Bars. 14 bolt SF. Hooker Long tubes, loud exhaust, BlackBear Tune.

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    • #3
      Re: Does high flow cats=louder?

      I'm not a fan of not running cats, or gutting them, but thats my opinion :read:

      On an 88 however, if yoy still have the stock cat, any high flow will make a fairly noticeable difference in sound and performance both :rocking:
      92 Jeep Wrangler 2.5 ltr 5 spd. Mods slowly starting...

      Details By Dolan, Santa Rosa CA

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      • #4
        Re: Does high flow cats=louder?

        Now if I could only find an excuse to change the cat. Dad says hayll no. Here in MO, they dont check emissions, cept visually seeing the cat. I want to put a pipe through it for now, its cheaper. I am still worried if I do gut it, will my torque move up in the rpm range, or will it be noticeable at all?

        2002 GMC Sierra SLE Z71 ext.cab 5.3L---Single 3" flowmaster 40 dumped, Spectre CAI, LT headers and ORY, Wheatley tune, Mid 15's

        Comment


        • #5
          Re: Does high flow cats=louder?

          Carsounds are like $0 off Ebay
          92 Jeep Wrangler 2.5 ltr 5 spd. Mods slowly starting...

          Details By Dolan, Santa Rosa CA

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          • #6
            Re: Does high flow cats=louder?

            Originally posted by LikeaRock14
            Carsounds are like $0 off Ebay

            holy crap, they're free :LOL:
            body lift. 35" MTZ's on 16-10's GK Bars. 14 bolt SF. Hooker Long tubes, loud exhaust, BlackBear Tune.

            Comment

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