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I dont know of any off the shelf kits for an ISF that have worked.
The ECU is not an easy work round in the cars and there are not enough of them out there doing this yet.
The kits I have seen are ranging from 7k up to $17.5k and range from 100whp to over 250whp gains. However much of the work needed is custom and the tuners to do this kind of stuff are limited around these parts.
With the limited power gains from doing it and the high cost you probably wont see a lot out there for this kind of thing.
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