Ok y'all,
I have posted this on every board on the net( almost hehehe) and well I have got 6 of 1 , half a dozen of the other. So, how about GT take off's instead of mustang V-6 duals( like Pypes) or Y duals?What do y'all think?
GT takeoffs are fine, and the 2 1/4" diameter pipes (just like your stock exhaust) will maintain some backpressure, which is good for your low-end torque. You can always weld in some flows later if you choose to do so. You will need to have a midpipe fabricated from behind your stock cats (cheapest option), or get an aftermarket V6 midpipe to use them.
Don't bother with Y-pipe duals. They are only for looks and give little if any performance gains, and are relatively expensive to boot.
Mine lost some low end TQ going from a 2 1/4" diameter stock midpipe and catback to a 2 1/2", and it was dyno proven. Why run 3" diameter pipes? It costs considerably more for what gain? 2 1/2" diameter is more than enough, 2 1/4" diameter is enough.