A point not mentioned yet. The increased restriction from the long
oil line from the trunk, or the trans tunnel for that matter, probably will negate the benefit of the larger valve opening. You want the line to be as short as practical, and the valve mounted remotely from the canister, as close to the engine inlet as well. Less flow restriction/reaction time for the
oil to pressurize the line between the valve and inlet.
Be careful if you mount it under the car, any impact on the canister will jam the piston inside. If you drive like me, (at least one or two agricultural excursions per event while looking for the edge) that means a sturdy shield.
McFEz