The old L16 is sad, smoky, leaky, slow and running on 3 cylinders. Rather than pour more money into rebuilding this engine, I want to bump the power a little by dropping in an L20b. Have a line on a good one for a good price. I keep hearing that this is a super easy swap, but I can't believe it's a simple plug and play. Will the L20b mount to the existing exhaust manifold? Will I need to repurpose the L16 oil pan in order for crossmember clearance? What else am I missing, or is my skepticism unnecessary? Thanks!