Anyone run a heads and cam package on their NA Cobra? I was looking at the setup that Ford Racing offers. Advertise a 60RWHP gain with heads/cam and full exhaust? Now, I'm still learing about the 4.6, I came over to the 'dark side' from the GM camp. Is it just me, or does that seem like a really ****ty gain for $2-3k? Is there much to be had N/A w/ Heads/Cam from other aftermarket vendors, or are you pretty much steered into the FI route to break much over 400horses?