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Bad ideas. Install the entire dual exhaust system now, or wait until you have enough money to do it, or you are wasting your money on a single now. When you go for the duals later, they will replace everything again.

Also, repowering with a V-8 sounds like a simple and good idea, but you are better off trading in your V6 for a V8 truck.

If you only have one pipe coming off the motor now then you can install a new muffler without conflict.

Most dual exhausts are in the 2" to 2 1/2" range. I had duals on a 454 that were around 2 1/4" and this was fine. I initially had glass packs and later went with flow masters and 2 1/2" pipes (withe headers) and the power was the same but it rumbled like a T-Rex which was preferable to the louder glass packs or Cherry Bombs. As long as you use at least a 2" pipe you'll be good with either engine with duals.

If you go bigger than a 350 CID or 5.7 liter then you need to go 2 1/4" or 2 1/2". This will cover 400-500 CID engines.

Have fun but drive safely so you can enjoy your ride for years to come.

Good Luck!

First put in the v-8 then put on the flowmaster. I think a v-8 sounds good anyways.