There are videos of before and after the slots at the bottom of the original post so you can hear what it did for mine. No promises what works for others. Heres something to check under your hood: Theres a rectangular black box next to the driver's front side of the s/c, has a vaccum line going in one side and what may appear to be an uncapped nipple on the other. Thats supposed to have a foam filter on it but many are gone. Then along comes somebody looking to fix vaccum lines and they cap that. Instant GT, no boost. Now thats not a very technical description and I understand it may not be helpful but its something I learned poking around the forums. Just continue your studies here and remember to check dates before posting. No crime in posting on an older how-to but other kinds of threads maybe.