ya personally the x4 is pretty slick to use as the gauge itself. Put one with gearhead custom tunes in a friends pickup last week since he was on a budget and couldnt afford the CTS insight as well. turned out it looked decent and functionality was good as well. All he needs is something to monitor EOT,ECT,FICMv,ICP,IPR. the X4 will get him there and tune his pickup to be alright with stock headbolts (custom tuning of course). So many different options now and i heard that SCT is coming out with shift on the fly tuning for the 6.0?