Don't know if you have the time for it, but I could certainly see a market for it if you were to put together everything needed to install this kit like the lines, fittings, scavenge pump, etc and sell it here on the forums. Maybe even as far as modding some stock fuel rails, depending on the...
What does the ratlle sound like. If I'm driving and holding at 2k, I hear what could be described as a rattle, but I'm pretty sure it's the transmission.
At least you're not in my shoes .I bought a cpo 18 with 1k miles to avoid a depreciation hit, but now if mine turns out to be a dud, I have no legal protection. Mine ticks, but hardly noticable.