After reading a few posts on intake manifolds and the problems people have been having witht eh AEBS... thought it was the sane casting, just different OBD... anyone got any clues for this moron?

Rich

 

b16a1 and b16a2 heads are the same. he may have a gsr head on there and not even know it.

 

The sir2 head has different dizzy, and a different intake manifold. It is cast with the same pr3 head, and all the same valvetrain most likely, but from what i've heard the sir2 also had upgraded cams (basically gsr cams)