[sstd595]

what would be best for air flow and to maintain airflow veloscity? What inlet/outlet sizes?

 

[strictlydiesel86]

24x12x3 ic w/ 3" I/O. you will need reducers to fit the turbo and plenum though. or if you can find a 2" I/O that would work w/out reducers.

 

[DavidPhillips]

it should be 2.5" on the truck. So reducers will be 3" to 2.5" or go with everything at 2.5"