When I bought my rig the stock rack was sort of iffy.
I gave it a pull and it came right off.
The rivet nuts were glued in, not riveted.
Since the holes were already in the roof, it was easier to install than remove so I just pulled the rivet nuts tight, reinstalled the whole mess and that solved the water leak I would have by just removing the thing.
After that I put on a yakima rack with a rocket box, ski racks, bike racks, all depending on whether I'm skiing, riding, traveling, whatever.
The whole mess is garage sale/swapmeet stuff, total cost of the whole system is about $200.
If you are patient you can duplicate or even beat my cost, if you want the wind noise to go away, put a fairing on it. Yakima makes one, Thule makes one, or you can just make your own. It just has to seal to to roof in front of your load bar to break up the air flow.
If you don't weld, this is a great way to go.
I don't see much change in mileage unless I hang the rocket box, then we go into single digits.