Being sued by dealership, any input

DCNISMO

If he signed a contract that stated the emissions were not modified on the Z then he voided the contract and liable. Sure the dealership should have checked. One should never sign a contract unless you read it. My last two cars I told them up front that I had high flow cats. If at trade he told them that he had text pipes they would not have taken it in as trade. A place in Va got busted a few years ago for violating the federal emissions act by selling cars with no cats. When it was time for a two year Va inspection people that bought catless cars ratted them out. Emissions are federal not a state issue.