I love my true duals & I love the way they sound. But would I have any significant gain in power if I was to have a custom y-pipe built, dynomax free-flowing cats, and a 3" dynomax bullet? Or would I be better off just leaving my duals on my truck?

I really don't think I'll be able to afford a turbo or supercharger on this truck in the next year or so, so it will probably always be N/A. I would love to add a turbo though.

 

think about it true dual 2 1/2 agains single 3 which one will give you
more flow. But I will get the Hf cats.

 

I'd keep the stock cats, they flow plenty for your application. I know that on other engines I've worked with like Dodge Magnum v8's it's true for single exhaust yeilds more power. However on these, I believe it's not the same. I'd keep your duals.

 

2.5" duals are costing you lowend power. You have about a 320" motor and it spins to maybe 6200rpms with that cam, 2.25" duals are plenty large or drop back to a 2.5" duals into a 3" collector.