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.

  1. Sleek Motoring

    Sleek Motoring Local Shop Owner

    Dec 7, 2014
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    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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    May 4, 2009
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    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

    Jul 29, 2012
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    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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    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

    [email protected] New Member
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    May 4, 2009
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    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

    May 15, 2012
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    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

    Dec 7, 2014
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    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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