Where to buy dual exhaust kit for 4X4

[AirSpeed]

I've picked out my mufflers, Flowmaster 40s, now I need to find a dual exhaust kit that fits for $200 or less. I have a MIG so welding it up is no problem. I have a 72 short bed GMC with 350/350 auto with stock exhaust manifolds. My truck has a four inch lift as well. I want to run the exhaust straight out the back. I'm guessing 2 1/4" pipe will work fine but am willing to go up to 2 1/2" if it's really going to be an improvement. I haven't figured out what offset if any my mufflers will need, it's been suggested that I go with center in and offset out but would like to know what you guys have used and what works.
I want to install the exhaust myself to save money and would like to keep the exhaust (minus mufflers) under $200. Thanks for any suggestions!
Posted via Mobile Device