I'm surprised you haven't been POUNDED by these guys for this...Honda...

But serious, that's the most INSANE thing about the CA (and I'd bet other states) smog inspections. Who cares if it's not "stock", as long as it sniffs clean. Isn't that the point: CLEAN AIR? I have a friend with a blown 351 in a 89 LX Mudstain notch. Actually sniffs CLEANER than the OEM 5.0, but every 2 years he does the swap to get re-inspected...