Yea... But how hard is it to unbolt the manifold and bolt on the stock one? VS yankin out a b16 and dropin in a d16.... Im sure they would pass a b16 if you had a BAR certificate, but if you put 1 mod on that thing I garantie you it wont pass! A D16A6 will pass smog with Hi pistons, 3" exaust, headers and a intake on the dyno! I know... My neaghbor has all that and he passed!