Well on another forum someone posted this:
You will LOSE power
It wont sound good, ever heard gas trucks with stacks? sounds like crap!
You will LOSE torque
You will LOSE mpg
It will be a ***** to start, even with fuel injection
Theres a good chance of burning your exhaust valves from not enough backpressure"
I am also not running a CAT. I just dont want to do any damage. I dont have money for a muffler so free is a good deal.