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for the 12v's yeah that is your overall HP that you will have, for the 24v's its that much over stock so for example i believe a stock 24v starts with 235 HP so with 60 HP sticks you'll be at 295 HP and so on up thru the numbers.
You can do it on line if ya want. We are working of software with the "add to cart" feature on our web site. If you want, I get CC info, then send injectors. You can call, pm, email ect.