3.5 inch collector to 3 inch exhaust

I'm curious too, I'm switching to 2 inch headers and to 3.5 inch x-pipe exhaust from 1 7/8 headers and 3 inch x-pipe exhaust in a 396 amc and 650hp. Next spring when the track opens well know.

Going with Dr. Gas spin tech mufflers and x-pipe.

www.drgas.com