If you want to keep it quiet on the highway, you either need to keep that ugly thing, or find a replacement for it thats straight thru! I hate looking at mine also, but I'm not ready to listen to it drone, so I've decided to live with it.
If you deleted it, you can use a large diameter resonated stainless steel turn down or angled tip that would look a lot nicer, but I'm not sure how much it would cancel the drone out. Unfortunately someone has to try it to find out.