| Yes, the cat for the verticle cyl is in the muffler (on the stock muffler) and the cat for the horizontal cyl is in that pipe. That's the only reason a 1/2 system comes with a new pipe for the horiz cyl...to get rid of that cat since the other cat is eliminated with the new muffler. You are also correct about the different diameter pipes. It is for the tuning so the cylinders are balanced. Don't want to mess with that. |