I am in the process of combating this problem on my car as well. I personally will not be doing any power mods on my car before it is resolved. I've yet to see any side by side logs of a stock car vs. a car with DP, so I cant say for sure its bad. But if youve got the money for a DP why not save up a little bit more and get some EM first? Especially something like Cobb where you wont have to pay anything more when you do get the DP. There is another fix in the works though. You can PM crazymikie on NASIOC for info on it, but youll need a way to take datalogs from your car and flash a new ROM image to your ECU.

You can check this thred for the entire discussion on this problem and all of the solutions. Ive done a bunch of research on this so if you have anymore questions, lemme know.