Being an old fart I like a quiet exhaust most of the time. I replaced the cat with a 3 inch Warlock bypass muffler. It fits with a little room spare. I put an electric cutout on the bypass. I cut and welded the stock I pipe to hook up to the Warlock muffler. I replaced the stock muffler at the back with a cheap flowtech turbo muffler. This setup is very quiet with a single outlet. When the cutout is open it is like an open Y pipe, very loud. I was able to use the stock hangers.

93Z M6 RED
B&M Shifter
egr, tbb

 

So you got two mufflers now. Yeah I would imagine that is pretty quiet then.

 

Well the two mufflers in series is very quiet. It even adds a lot of low end torque (1500 RPM or less) on the other end power falls off between 4000 and 4500. When I say falls off it almost like hitting the rev limiter!!
Normal driving is improved, have to be a little careful from a dead stop very easy to bust the tires loose, kind of reminds me of a big block out of a truck with a governor set at 4000 rpm.
With the cutout open everything is back to normal, fast and loud. I am pleased with this setup, could not help myself, took off the Z28 Badges, sleeper mode can be fun.

93Z M6 RED
B&M Shifter
egr, tbb,

 

man alive my dad would love to do that to my car!!!!! i just have mac mids to a off road y and a cut out

i do like your system, seems like it would be very quiet

 

It would be 10x easier to have just kept your stock exhaust and put an electric cutout in the i pipe. This would have cost half as much, and you could still have used to original hangers