It won't be much louder with a standard backbox and a straight-through mid-section. It will sound a bit more 'growly' but the volume won't increase much.
This post is an artistic work of fiction and falsehood. Only a fool would take anything posted above as fact.
62k Diablo Phase 1 Gti-6: Project Thread
62k Diablo Phase 1 Gti-6: Project Thread