Looking to get my XCAL2 , but wondering which is considered the better (or preferably of course - the best) at tuning these for the '05 V6 Mustang. I have heard rave reviews from both Brent from Brenspeed and from Lidio at Alternative. What's the general consensus on their work and results. Price wise they are about the same, so its performance and results that I am loking at. btw - Anyone know how much of an improvement these tunes can do to your 0-60 times - not just quarter mile?