I've got two questions for my 96 Disco.

1) I need to replace my exhaust and want to upgrade to improve hp and performance. This will be my second replacement. For my first, I was short on cash and just needed it done quickly. Now I get to do it again. Rovers North sells the NRP stainless exhaust and a competitor sells a Borla brand exhaust. No offense to the Rovers North guys, but is there a significant difference between these two brands from a performance, quality or sound standpoint? Or are they fairly similar? Does one sound more "stock" over the other?

2) My family and I like to go camping and have started towing travel trailers with friends. My friends usually have a less stressful towing with their full-size pickups since they have longer wheelbases. I remember reading in my owners manual that I should not use load leveling bars when towing. Why is that? Does it negatively impact the drivetrain on the Disco because of the permanent 4X4?