take it to a dyno, test your HP before hand, install then test it again, and tell us if you get any HP imporvements!!!! That things is like VTEC yo!!!

or you can tell them to give you 110% of your money back, and see if they even do that, i bet that extra 10% is just to cover your shipping costs, so youll just end up breaking even, but at least they lose money on the scam