checked HMA service..but i'm not really too good at finding what i'm looking for on there.... my Scoupe Has Factory headers... 4-2-1 it "looks" like ..but i could be mistaken... just curious at the collector size.... Reason is i want to put a high flow catalytic converter, and change my exhaust to 2.5 inches back to my pipe...but came up with the question if the collector is factory and is the size of the factory exhaust like 1 3/4 inch pipe... then whats the point??? sorry i sound novice..but hey...i am smile.gif ..thanks for the help

 

If all else fails, pull it apart ang measure it, or better yet let the muffler shop do it.
Sorry I couldn't be of more help.