Aaron just replied to my email. He said based on their research the A/F would be in the high 12s with the pulley and an intake, stock was around 12.5. I'm just a little concerned this is on the slightly lean side, especially on a cold day. I'm still tempted to buy one and then hook up a wideband to it to see what the A/F are on my car. I just don't want to have to do anything else to make it safe (get a tune, add water/meth, etc).

Anyone with this pulley already hooked their car up to a wideband, or had it dynoed with A/F available?