Already shared too much but could not resist. I am not selling anything just a fellow Porsche guy. I picked up several of the 3.6 manifolds up off of Ebay for reasonable money, the one in the photo is a little over the top with the big throttle and high mount injectors. It is for my 3.1 track deal. How much more power over CIS hard to guess, it is a true tuned system and Porsche got it right. It flows enough air to make 300 plus HP if you are doing an aftermarket EFI and need something nice to hold the injectors I know I would give it a go.