[briogio]

I've seen the original VX exhaust manifold and it's unique among Honda manifolds; all the exhausts come straight out (90 degrees) to a central chamber where the O2 sensor is put in the centre, at the top. Then it goes down into a cat. That leads me to think that Honda wanted to put their 5 wire O2 sensor in the highest heat location. As the original VX manifold is hard to find, I'm going to try and modify a regular 4 into 1, locating the sensor in that 4 into 1 hotspot, at the top, then heat wrapping it to keep it hot. Has anybody done that?