Yes, side exit or stacks are much louder, no muffler need apply.
I run straight 4" with a right rear exit via a 4" turn down just beyond the mud flap. Its very loud, droans like cazy when towing. Neighbors can hear me coming for a mile or better, police turn thier heads to look. Any louder and I would get a ticket... . I run it straight because its cheap. Source Automotive has great cheap systems. . I'll add a muffler when I get the money, its really loud with the windows down.