What shoud I worry about?

I'm thinking of getting BBK Ceramic long tubes, BBK o/r H pipe, and magnaflow magnapacks.

What are some things i should be worried about with this set up? Would there be drone at highway speeds?

If you think i should change something make a suggestion. I'm looking for a muscle car sound but i want it to be really loud as well.
 
i used to run a catless xpipe and slp loud mouth and stock manifolds ... it was freakin loud so i went to a muffler instead of the slp's long tubes cost alot of money and you have to basically pull your K member out to get them in and you only get like 10-15 hp n/a out of it i never felt they were worth the time or $ for the hp but thats just me ill probally put a set on when the motor comes out