Alcohol content is fine on plastic and rubber, it's what the stock injectors and fuel pumps can deal with.
The JB4 is a boost controller. It tells the ECU that there is less boost in the intake manifold than there really is. The car then adjusts everything else upwards to hit the mocked...
It's not even hard to pack them up. Throw something soft on the face, cover with plastic, wrap with movers wrap, slap the label on it. pirateship.com for good pricing. Great even. Cost me $50/wheel to ship my stock wheels to California from Chicago.