Dobeck makes a true live time monitor and plug and play kit which is their AFR Gen4. It comes with a AFR gauge, and in this application requires a newBosch 02 sensor to be installed (new exhaust bung must be drilled and welded). The new kit actually gives you real live time AFR settings, versus the cheaper ones I have seen which is simply levels over or under stock ECU settings. The Gen4 offers closed loop and open loop tuning points, as well as 6 different settings that affect, green zone (idle), Yellow zone (cruise mode), red mode (high RPM), as well as at what points the the ECU switches between green, yellow, red zones (based on load and RPM). If you understand AFR settings, this seems to be the best way to manage adding or removing air via, filters, exhaust, etc to the fuel management system.
Mine goes on this week so i will post pictures and review after that is done. I am very famaliar with this company as the owner started the company known as Dynojet which is a large player in the automotive tuning world.
$399, but if you live close to MT they give you a $50 local discount as well.
Cheers