Personally I think it would sound bad ass. Before I installed my Magnaflow cat-back, I had the stock over the axles with Magnaflow 15594 muffler deletes. It was 'effing loud but it had a very exotic sound in the upper rpm range. Much different than with the stock headers. This was using an O/R x pipe.
to bad no one has that combo. but its 800 dollars cheaper to go that route instead of the full setup w/ LTs