I've had both good and bad results with FAST XFI customer service. It seems like I used to have a lot better luck with them than I do in the last few years. If I write an email it will not be answered. I've written probably 3 separate emails regarding the XFI 2.0 and various engines and support for them. No answer. I used to be one of the people that stood there and shouted FOR fast... Lately, it's hard to deny what holley's got going on and seem to have better support. If I didn't have several XFI systems already, I would switch over to holley like many others have.
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