A system for scheduling and controlling presentation of data includes a data library operable to store a plurality of features and promotional data. The exhaust module supplies a first MAF to exhaust produced by the engine upstream of a catalytic converter during regeneration of a PM filter located downstream of the catalytic converter. The modular joist unit is attached to a surface on an edifice. In some embodiments, a guard flow is provided around the carrier gas. A tire monitoring system with a tire pressure based energy scavenger is also provided. The administration of the D-threo isomer eliminates adverse side effects associated with the DL racemate, and provides improved effectiveness.