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Testarossa exhaust question

Discussion in 'Boxers/TR/M' started by Kentucky87TR, Jun 12, 2007.

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  1. Kentucky87TR

    Kentucky87TR Rookie

    Oct 10, 2006
    13
    #1 Kentucky87TR, Jun 12, 2007
    Hello, I am interested in replacing the exhaust on a stock 1987 testarossa. I am interested in the x-ost muffler back system, but am slightly confused as to whether the hyper flow cats or test pipes or pre-cats will be worth the investement if I am going for purely sound, and not so worried about a performance increase. How much of a difference in sound will I notice by just switching to test pipes vs. stock cats? Also for switching the pre-cats? Lastly, is engine removal required for any of the above replacements?
    Thanks in advance for your help.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,839
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Jun 12, 2007
    Last edited by a moderator: Sep 7, 2017
    My 2 cents on some possible US TR exhaust configurations:

    I. Precats + cats + stock US silencer = very quiet except at high RPM

    II. Precats + cats + aftermarket silencer (e.g., Tubi, X-ost, etc.) = quiet except at high RPM

    III. Precat bypass + cats + aftermarket silencer = moderate at low RPM and loud at high RPM

    IV. Precats + cat bypass + aftermarket silencer = makes poor engineering sense -- better to use configuration III.

    V. Precat bypass + cat bypass + aftermarket silencer = loud at low RPM and very loud at high RPM.

    VI. B. Badurski's minimalist system = crazy loud ;)

    Engine removal is not required to change the exhaust system components, but the body panel and louvres below the exhaust tips must be removed (15~20 small bolts IIRC).

    Don't know if they'd be any less expensive nor available anymore ;), but F also makes insulated precat bypass pipes -- configuration III (with the F precat bypass pipes) and VI shown below:
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  3. Ferrari Mackintosh

    Ferrari Mackintosh Formula Junior

    Sep 21, 2004
    716
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    #3 Ferrari Mackintosh, Jun 12, 2007
  4. testarob

    testarob F1 Rookie

    May 13, 2006
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    #4 testarob, Jun 12, 2007
    Last edited by a moderator: Sep 7, 2017
  5. mgtr1990

    mgtr1990 Formula 3

    Mar 30, 2005
    1,580
    Naples Florida
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    Martin Graham
    #5 mgtr1990, Jun 12, 2007
    When I had my TR I did the Tubi/Hyperflow and replaced the Pre cats with a straight pipe it was OK but nothing like a 355 or 360 with Tubi and Hyperflows.
     
  6. KENCO

    KENCO Formula 3

    Nov 1, 2006
    2,396
    FL
    Full Name:
    KJG
    #6 KENCO, Jun 12, 2007
    I have that exact setup!

    Pre cats gone, Hyperflow cats, and x-ost muffler........sounds great!
     

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