Are there any after market head units that can be used to display engine stats? I was just looking at the prices of an Edge CTS2 ($400-600) for monitoring, then add the tuner (about $700+) and it gets spendy quickly. Got me thinking that perhaps there is something on the market that plugs into the OBDII port, reads the data from the sensors, then outputs it to a display such as a head unit. In that configuration you'd at least be spending money on a nice head unit that you'd use for other things as well. I might be totally off base here, but figured I'd ask.