i could definitely tell a difference when i installed mine. I don't believe there are any before/after dynos to show the difference directly. Some people have suggested that the gains are more apparent at higher boost levels.
But, this will never crack like the stocker is so prone to do (thats the reason i bought mine).
(2thumbs) Yup! I switched to a 626 mani, and my MAM gave me issues with taking off the EGR tube, so I ended up having to take the entire MAM mani off, the turbo, etc. just to be able to get a chance to take the EGR tube off. After getting pissed off at the MAM, I decided I did not want the hassle of putting it back on, that thing was a b**** to take off! I'm looking forward to the Steedspeed mani, and hoping it will be a nice addition to my car