I was think more of going with a P-log and a down pipe, and of course a pulley. What size pully would I drop to and whold zzp be the place to purchase this also, and if so which one.

I do have a Aero force scan gauge currently.
If possible with my curreny mods and with the downpipe, P-log, and pully what kind of HP would I generaly be pulling? 300?