Well to comment on some of the above posts I will say this; I believe that this post is meant to help a fellow 2gnt'er on helping him with his running rich problem not bashing others on there dyno and parts credibility. I think 5 or 6 of the total posts on here are helpful to him, the others are just bullshit. Sorry guys.

On the other hand, I have owned a turbo'd GSR hatch that was dyno properly and with a wideband o2 sensor to have someone at a local reputable shop here in Tampa tune my V-AFC. After everything was properly tuned like most turbo'd cars, 4G63 or not, it would puff a bit of BLACK smoke out in between WOT shifts. Like I said before, If you're not fouling out plugs and its not smoking all the time, just a puff here and there that you are tuned a little rich which is perfectly alright.

Ark, if you have nothing to say thats helpful, PLEASE stay out of the post.