Charlie Booze gave me one to test on my car at a local track. I didnt see anything but Charlie told me that in some instances he has to jet the carb up when dyno tunning to get very good results and just putting one on with no carb changes sometimes won't do anything. Also when I had my stock heads on and tryed a spacer there was no change so also if you out of head like I was at one time, it dosnt matter what you do on top if its not getting through the heads.
Agreed...I know I'm running a little on the lean side as it is right now so without making any adjusments to the carb I just leaned it out a little more with the spacer....I'll do some plug reading and jet up as necessary.
It's amazing to me that you're being that consistent on Nitrous. Sorry to hear about that t-brake issue.
I have the Wilson Manifolds version, I noticed that my plugs looked more consistent when I ran the contnoured plate on top of my nitrous plate.