Originally Posted by lenzm3edan
so the Vf540 uses the same manifold as the VF620 minus the heat exchanger that can simply be added. To upgrade the ESS 550 to 625 the whole manifold needs changing.
Correct. We provide the same exact manifolds for all Levels we offer for the E9x M3's.
The VF540 comes with a block-off plate in place of the slide-in cassette heat exchanger. You can see the plate below: