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I don't think you can borrow someone else's G5 tool, because I think it's linked to the VIN.
For $950, I'd just buy the tool and do it myself, and forgo the dyno. I paid a shop to do the tune for me the first time out of convenience, and now I'm about to buy the header tune upgrade and I'm going to be getting the G% this time around. Should've just bought it in the first place!
Honestly, i think the piece of mind of being able to reflash if needed is worth it.
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