There are two places that can do it that i know of... SCC or Karl Norris
My choice would be karl only because ive used him before...
The advantages of having the fueling set is that you engine wont melt almost instantly when you accelerate with 20 Psi only dissadvantage is that your fuel bill will increase.. as although it will fuel correctly on WOT the car will run slightly rich on idle/part throttle... (not a very bad thing as it will cool the bores)
cheeRS
Phil