[S_Mazza]

I have a quick question about exhaust manifolds. I know that the 3.8 passenger side manifold changed between 89-93 and 94-95 (collector angle).

My question is, which years and models have the O2 sensors in the manifolds, and which have them in the downtubes?

Are the SC manifolds different from the NA ones?

I seem to recall that my 90 SC has both O2s in the manifolds. Maybe I'm wrong about that.

Thanks in advance!