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  1. #1
    BMW OWNER
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    5401-IMPROVING HORSEPOWER

    I would like increase my horsepower on 540I without risk to factory warranty. Does anyone have recommendations?

  2. #2
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    Member No: 79266 thematrixz is an unknown quantity at this point thematrixz's Avatar
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    Re: 5401-IMPROVING HORSEPOWER

    I believe the only tuner that's approved by BMWNA is Dinan, which will not void warranty.

    Going from mild to wild, you could start with CAI, engine software, tranny software (for automatic tranny), then you can go to stage II or stage III for more power. At the top of the list, go with Dinan super charge, that will add a really nice boost to the already mightly 4.4L engine, but it comes with a price, both in $$$ and longevity of the engine.

    There's only one Dinan authorize dealer in MA, I think it's in Norwood.

    Tan

    1999 540ITA Sports, Dinan CAI & software. M5 rear swaybar. Debadged.

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