9 lbs 9 oz
The cores not replacable while its in the car. The core is welded to the removable plate and uses o-rings to seal where the inlet and outlet leaves the core.
Their is way less of a possibility of having a vac leak because theirs really only 4 small spots for that to really occur. This design also allows you to maximize the core thickness while packaging into 2.125 inch plate. The core is thicker than this because it drops into the intake manifold.