I wouldn't bet on the Y-pipe fixing or reducing the drone. If anything, just like my previous exhaust experiments with my Sentra and now Coupe, removing a cat and replacing it with a piece of piping will increase inside drone/noise. It did the same with my Alti Coupe when I put the Y-pipe (more noisier, but not bad, since the car was pretty quiet to begin with using the ebay exhaust).
If you have lots of unbearable drone, I would highly recommend you have a 18" resonator put in, it should reduce the droning quite a bit, along with reducing over all loudness (if you don't mind that). My ebay exhaust came with a big fat resonator (24" long?) and without it I'm sure I'd be in hell noise city. Sometimes I wish though I could remove it, because the car's too quiet.
