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Thread: 2.0 S MFI - Headers/Muffler require fuel adjustment?

  1. #1

    2.0 S MFI - Headers/Muffler require fuel adjustment?

    Hi all - relatively new to the MFI world, so apologies if this question has been discussed elsewhere. I'm considering changing out my SSI H/E's for a set of equal-length tubular headers and swapping the current Dansk sport muffler with something else. The motor is a 2.0 S with MFI pump (serial ending in 005) and runs great.

    Will adding a freer-flowing exhaust create drivability issues or should I expect to have to retune the MFI pump?

    Will eliminating the warm air flow to the MFI pump cause warm-up issues?

  2. #2
    Senior Member 2.5MFI's Avatar
    Join Date
    Sep 2006
    Bend, Oregon
    Since your considering this and your engine runs great, in my opinion I would leave it as is with your SSI H/E's and sport muffler. Reason I say this is because I have run a few tests on a dyno over the years and found with a 2.0 MFI engine there is a loss of low end torque when using certain equal-length headers. And with the loss of your warm air thermostat you will have to fabricate a cold start system. Not a hard thing to fab but with these changes I don't really see a big leap in performance gain.
    Mark Jung
    MFI Werks
    Early 911S Registry #972
    Carrera T w/LWB, MT, RWS, PCCB
    72 T 66 x 100 MFI Twin Plug Coupe
    R Gruppe #686

  3. #3
    Very helpful. It's already fairly anemic below 5k, so might be best to leave well enough alone.

  4. #4
    You might want to check for full throttle,,,,might be surprised!
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

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