Weather it has a tune already or not is not the issue.
Just treat it as though it doesn't. You don't have the Xcal, so you can't datalog and send them to a tuner for updates. So even an old tune is useless.
Contact 1turbofocus and see what he can do for you far as prices.
Don't "think outside the box".
There is no box.
Do it correct, or do it twice.