Sweet, 3" should make it exhale with ease. 

NOICE!!
Fully stainless?
Reason why I am going 3" duals is because I am building an ls1. I've been buying parts to build my transmission up and then I can get started on the ls1. I plan on being in the low 11's on spray.
I am doing 3" also because of two main guys I run with at the track who have both proven that their n/a trucks run better with 3" duals, and running low 11's
Figured why do exhaust twice?
Yes the magnaflow has a built in x-pipe.