Compatiable with the old welded on flanges and sleeves. There not on there website yet. These are the part numbers for them.
12536 (3.0")
12537 (3.5")
12538 (4.0")
Profab sells there manifold's and up pipes with a pinched PS up pipe for trucks running a down pipe in stock location .
Can you run a hood stack? If so bring it around the top of the motor and than up and out the hood.
Yeah, that's my fear that it will drain the batteries down too much and if I have to shut truck down for some reason it will not have enough power to restart it.