I have 2 cats, 1 on each side before the Y, then the Y, then one bigass muffler, and that's it. The muffler has clamps on each end instead of welds to the pipe. Is this stock, or has someone made some changes. I bought the truck used so I'm not sure. My 2004 had 4 cats (2 on each side before the Y), then the Y, then a bigass muffler, then a resonator or something above the rear axle in the talpipe. I figured the '05 would be the same, but it isn't. Also, since I have only 2 cats, one for each side of the engine, I'd assume they are not restricting flow much. And the pipe seems big. I don't think it is worth changing anything except for maybe just the muffler. What do you guys think?

 

I BELIEVE IT A RESONATOR TO FURTHER QUIET THE HEMI. I HAVE ONE ON MY 06 HEMI QC. I HAVE 2-CATS 1-BIG RESONATOR, 1 BIG MUFFLER, 1 SMALL RESONATOR.