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#4: 03-09-2009, 07:16 AM
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Title: Monkey
Location: Queenstown, New Zealand
Car: Black 1998 Legacy GT-B Limited (JDM BG5)
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Allot of things cause 66. It sounds like you have have blown a solenoid somewhere or secondary turbo or something... 66 has been labelled "Sequential turbo system
No rise in pressure or pressure excessive (Over boost)" as well as many other things

You need to take it to a subaru dealership and have them take a proper look at it.