I've seen numerous threads with mixed reviews and most of them were from a few years ago. i have the fabspeed 200 cell headers and awe switch path exhaust. I'm looking to add the IPD plenum and Fabspeed intake. The one factor that most threads didn't mention is having it all put together with a tune. i currently have an evomsit stage 4 tune and with the plenum and intake, I have would have to have a different map.