PZEV=Partial Zero Emmision Vehicle.....sho basicly you'll hvae some leverage against CA when its time to smog,lol. With the SRI?!?! not my type but hey try to get something legal. based on the prices,yea there expensive but you'll never have to remove it every 2 years. unlike my cheap ass the spent $50 and now...yeah. I'd say chill on exhaust and get a drop instead,even if its just springs.