In the process of a MPFI 468 swap in my '90 K5. Been looking for a mandrel bent exhaust kit. They are out there for K5's but I have only found them with 2 1/4" pipes. I've been told I need 2.5"-3" for a BBC. I was thinking that I could just have a local shop bend some pipes for me. No, they won't be mandrel bent, but if I started with 3" pipe then the restriction caused by the bends would drop it a little. I figure even with the restrictions I would still probably have 2.5" there, so I'd have at least a 2.5" pipe at the most restricted points. Opinions??? Anyone know of a vendor that will mandrel bend an exhaust sytem for my truck?