I can get duals over the axle with x pipe and bullets for right around 100 dollars...but thats not mandrel bent. How much of a difference will this make?Right now my car is bone stock

 

I personally would not put crush bent pipes on my car, but i suppose if they're using big enough pipe to start with, you wouldn't lose much. But i mean, if you're gonna upgrade the exhaust, why limit yourself with crush bends?