Anyone have this combination?
Anyone ever had my similar issue with Mufflex or other brand bypass pipes ... with shorties?
FLP makes a system with interchangable cats. They are not in the stock location, but cars pass the roller test with them all the time. You can do this with other brands too.
I don't think the JBAs add much over the newer stock manifolds (I've forgotten which year got the update, it may have been the 2000 model but certainly the 2001). You could pick those up from someone dirt cheap and not spend the cash for the JBAs.

