1). This kit does not require a tune.
2). BBK quotes a 10 to 12 horsepower gain at the crankshaft as a bolt-on.
3). For international shipping, your best bet is to use our International Checkout Option on our "cart" page when you're ready to purchase, or you can give us a call directly at 1-877-578-2433 to go over more specific shipping options.
I would, however, implore you to double-check that this intake is compatible with the UK's emissions regulations before ordering, as I'm not entirely sure of it's legality under TUV or whatever regulatory agencies the UK uses.