[gearmesh, inc.]

Hal's comment on GM V-6 exhaust systems sounding decent just gave me an idea. Most of the V-6 GM cars I have noticed run a Y pipe up front with a single feed into one muffler, and dual out the tailpipes from there.

Try this out. Up front use a Flowmaster 2 into 1 collector to form your Y-pipe up front. The Flowmaster 2 into 1 collector has a 3" outlet. Run a single 3" pipe from there into a single 3" muffler of your choice. One 3" pipe flows just about as good as dual 2-1/4" pipes, as the total cross sectional area is nearly the same. Dual it out AFTER the muffler to keep your dual look at the rear of the car.

Way back when I had my supercharged 5.0 1993 F150 longbed, this was how I ran the exhaust. It ended up sounding identical to a 5.0 mustang. All the other longbed trucks at the time with a 5.0 Mustang powerplant with true duals did not sound near as good as the same motor would in a Fox body. After my truck's big single exhaust sound came out identical in sound to a true dual Fox body 5.0, a bunch of us came to the conclusion that the reason why truck true dual systems always sounded different was due to the longer run of pipe.

I believe your best bet is to run both sides of your engine into a single muffler and dual out from there.