01 wrangler with po432 catalyst 2-1 efficiency
have a 2001 wrangler w/ 4.0 inline 6cyl has 2 piece exhaust manifold.has 2
cats right off the mani and 1 after the y-pipe.how do i know weather 2 replace
the 2 together in y-pipe or 1 down stream past y-pipe.Allegheny county
emissions suck