I've installed 6 sets of Jammer Nozzles so far and they have all done exactly as claimed.
The Injector nozzles are a great deal. But, the install is a little more than most guys really want to jump on without a little advice.
To install these you need to remove your stock injectors, dissasemble them, reasemble them with the new nozzles, re-install the injectors into the vehicle, and away you go. If at all possible you shoud have the injectors pop tested after you reassemble them, although its not required. I might even start offering assembled/tested sets on an exchange basis for a minor charge.
The price listed on that site is the standard price.
Later,
Wes
(903) 355-4475