In agreement with FredR, installed the Remus and
removed it at great cost (drone was so bad I removed the Remus after about 4 months and purchased a brand new stock catback b/c I had already disposed of the original stock catback). The aftermarket catbacks drone at the automatics normal rpm range. The only solution is the OE catback.
If you had a manual transmission, I would go with Remus. But with an automatic, stick with stock.