I have LTs and the borlamouth setup. It really isnt that bad, just a lot of hissing noise along with the rumble. Cabin noise at 70 mph is actually quieter than it was with just the LM or BM because the tone is deeper. I ran the setup with the TSP catted y, and now with the ORY. Catted sounded slightly better. The noise is tolerable to 3000 rpms then it changes from freight train to thunder storm.
http://www.youtube.com/watch?v=gr9WTGZht8Q