The van will need a smog check in order to complete the title transfer / registration process with the California DMV. Depending on the county in which you intend to register the van it may or may not require a STAR smog check (as opposed to a regular smog test), which you can get at any STAR certified smog station. We recommend checking with the DMV first so you don't end up wasting money at the wrong type of smog station.
In terms of emission equipment, if in fact no emission system modifications (tampers) have been made and the van's exhaust emission fall below California's smog cut scores, it can pass the California smog check without any additional emission parts or upgrades. Whatever emission equipment the van was equipped with from the factory (as a 49-State emission legal vehicle) is all that is needed in order for it to be registered in California; after it passes a smog test.
We should mention you can always obtain a smog check "pre-test" from any smog check station in order to see if this Chevy G20 van will pass an actual smog test.
