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HELP - Hyperflow Installation Problem

Discussion in '348/355' started by Monteman, May 16, 2009.

  1. Monteman

    Monteman Formula 3
    Rossa Subscribed

    Feb 9, 2006
    2,246
    Santa Barbara, CA
    Full Name:
    Monte
    I just finished installing a set of Hyperflow cats on my car (355 5.2). I took my time and everything went smoothly but I wasn't quite comfortable with the tightness of the fit of the sleeve that goes on the end of the cat where the cat meets the muffler (Tubi). I just couldn't get it tight enough and sure enough when I start it up, there is a very slight leak. I doubt this is normal but would be curious if anyone can tell me if the Hyperflow requires a different sleeve or if I've simply done something wrong on the installation.

    Thanks!
     
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  3. f355spider

    f355spider F1 World Champ
    Rossa Subscribed Owner

    May 29, 2001
    17,268
    USA
    Full Name:
    Hugh G. Rection
    I would measure the diameter of the Hyperflow pipe end, and compare that to the diameter of the oem cat...that will tell you everything you need to know. Becare with overtightening any of those parts...they can all be broken if you are too aggressive with your tightening torque.
     
  4. Monteman

    Monteman Formula 3
    Rossa Subscribed

    Feb 9, 2006
    2,246
    Santa Barbara, CA
    Full Name:
    Monte
    Measured and they're identical. I'm going to loosen everything up in the morning and start looking on how I can close the gaps. Any suggestions on the sequence order of tightening things back up?
     

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