1st Gen R53 Cooper S Removing pre-cat from stock manifold.

Discussion in '1st Generation: 2002–06 R50, R53 & 2004–08 R52' started by Sleek Motoring, Jan 10, 2015.

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  1. Sleek Motoring

    Sleek Motoring Local Shop Owner

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    #1 Sleek Motoring, Jan 10, 2015
    I need to put the stock exhaust manifold back on the R53 to get the baseline HP reading before I start the build.My stock manifold cracked right at the pre-cat.

    Would I be able to remove the pre-cat material (see attached img) without it setting off a check engine light?

    [​IMG]
     
  2. Dave.0

    Dave.0 Helix & RMW Powered
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    #2 Dave.0, Jan 10, 2015
    The ModFather may have a stock OEM exhaust you can put on for a base line run. Shoot him a PM.

    Otherwise just stick your new header on.
     
  3. haygood

    haygood New Member

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    #3 haygood, Feb 13, 2015
    So, did you find out anything about this, Sleek? How about CEL eliminators? These are spacers to push the O2 sensors back a little out of the exhaust flow. They work on Audis with removed pre-cats.
     
  4. Dave.0

    Dave.0 Helix & RMW Powered
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    #4 Dave.0, Feb 13, 2015
    He used another OEM Exhaust header from a local member for his baseline run.

    He is installing a real RMW header for this build.
     
  5. Eric@Helix

    Eric@Helix New Member
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    #5 Eric@Helix, Feb 13, 2015
    BTW, when those headers crack there, it's a relatively easy welding job to put them back together. The same holds true for the main cat case which also cracks at the factory weld.
     
  6. TheModFather

    TheModFather Well-Known Member

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    #6 TheModFather, Feb 13, 2015
    They dont crack if it sits on the garage floor for a living with a real header on the car...

    Glad Sleek could blow the spiders out of my old OEM one, they had quite the little "Home" going on in there! :)
     
  7. Sleek Motoring

    Sleek Motoring Local Shop Owner

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    #7 Sleek Motoring, Feb 14, 2015
    TheModFather let me borrow his for my baseline run (Thanks again Rick...the spider BBQ went fantastic!).

    Sold my broken one! Still interested if anyone has removed the pre-cat from one of these.

    Would be funny/interesting to hear what a one ball exhaust and gutted pre-cat would sound like! It would be the ramen noodle performance exhaust kit!
     

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