i plan to use a magnaflow muffler when i rework my exhaust set-up. i have a 2006 silverado with the lq9 engine. nothing else yet. what muffler pipe size should i go with? i also plan to use one of the magnaflow dual-in/dual-out mufflers with the built in x-pipe. it would probably be a dual rear exit or dual exit before rear wheel.

what size pipes/muffler should i roll with?

i dont have any major plans either, just exhaust/intake/tune etc. cam and headers would be a long way down the road. thanks guys.