I am looking at this exhaust system for my car and the guy that I might get it done by said he would modify my exhaust system like so:

"Ok, my system replaces everything from after the main catalytic converter back. It uses a single pipe in and dual pipe outlet muffler ? Running 2 (2.25?) pipes to the bumper exits. I am selling the system ? Hand built and crush bent (Not mandrel bent) for $350.00 complete. "

What is Crush Bent and Mandrel Bent?
Which is better and why?

Thanks
Derek

PS: Is this a good system?


1999 Contour Sport SE (Black)
Duratech V6 MTX
Brullen Cat-Back Exhaust *LOUD*
S&B Powerstack Filter
Eurolite Xenon bulbs