Ordering a 6inch singe stack or a 7inch singe stack im leading tords a 7inch but im not shore plase help. And should i run 4inch turbo back or 5 inch turbo back? And 6inch stack tip or 7inch stack tip? I im gunna pull with the truck and i was wondering wich option will look better sound better and be the loudest set up. Please help guys thanks. No cat no muffler btw.