Mine is an OBS. It definitely came with the Vortec and MPI though. It has a cat for each bank and crosses over under the trans and Y's off to the pass. side. It goes 'single-in' to the muffler and single out.
The pipe doesn't have any holes in it, but is insanely restrictive. The crossover...
Hey guys. I'm replacing the midpipe/cats on my 2 door sometime soon. I got under the truck and noticed that I had a single input muffler and Christ, the MF 93603 is ridiculously expensive! Even Amazon is saying over $900. This would appear that it is because it has California emissions. I'm in...