Oops. I just figured out that the stock headers have pre-cats. I swear I did search before posting. Anyway,this is obviously why the stock headers are inferior to the MSDS.
However, about the Y-pipe. What size tubing is used for the stock y-pipe?
I need to make a decision between a stock optimized Y-pipe and a BAT y-pipe with cat. This leades me to my next question. How much better is the cat on the BAT y-pipe vs. the stock cat?
