I'm thinking about buying and getting a Black Bear custom Tune for my 2008 silverado 5.3 V8 very soon after i install the long tube headers and x pipe. I contacted Black Bear today through email and waiting for a reply back soon. My friend mentioned them to me because he's about to get one on his stock 2010 Silverado 5.3 and i was curious. I got to reading and it sounds like it would be allot better than a regular tuner from offline. You can tell them what you would like done to the tuner based on how you drive and how you want the spec's to be. I emailed them telling them i would like to purchase the most exspensive tune they off with the best HP and Torque gain's and also you can ride around while you tune your truck on your laptop and send it in to Black Bear and they will give you exactly what you want sounds like it couldn't get any better than that!!!