Blinkwatt-
After seeing a couple of your past threads I realized you are just dying for a bit more power. It's not worth the money to add "performance" products to these cars. Unless all your looking for is a better sound. Search and you will find many, many people who have tried everything under the sun and have LOST power! MNBoxster hits it on the nose...save the money and pick up an "S". Good luck!
BTW-Even after purchasing an "S" model I still wouldn't spend any more money on mods. A Porsche is a picky car. Mess with it and you will pay...big!