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Why?

They're junk.

Buy something stand alone and get a tune for YOUR car.

And a motec system exhaust.... Not a bad way to spend ten thousand dolllaaaaars.... :P

NisTune is a popular choice, Ask whoever is going to tune it first. As some tuners won't touch Nistune if your running some decent power. I was about to purchase one for mine, went to the tuner and said he wouldn't touch it. Because they're still not 100% manual tune, the ecu still overrides certain sections. As to how true this is i don't know, but just a heads up :)

i think you just have to have a tuner that knows what they are doing with it. my mate was tuning one in his ceffy and he was showing me one day just how many maps the nistune has that you have to play with if you want to do it properly. from memory there was 8 or 10 (and they all overlap), as opposed to the 2 for the pfc (ignition and fuel)

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