Sabin Performance does that mod quite often and it has been posted on the boards as well (works for 1000s, too). I don't have any dyno sheets on hand, but I will try to remember where I have seen some.
Basically, you are just changing the degree of the cams. If I remember correctly, stock is 105 IN, 103 EX (or maybe 102...), so this lets more air flow through the exhaust at 105 EX. This effects torque, though, I just forget exactly how.
If I have some time, I will try to dig some more definite info. I don't like trying things just based on board suggestions. The cam is $130 or more, plus at least another $200 for a full Dyno tune, so if you don't like the results, you're out a few bills along with time (takes about one to two hours to change the cams and check the clearances...assuming you don't have to order new tappets to make adjustments).
