leftoverz28

I'm not on here too often and I wasn't sure if this belonged in the exhaust thread or on here but I figured people on here might be a bit more knowledgeable.
My question is this; would putting a pacesetter off road y pipe and a loadmouth catback behind a twin turbo setup be detrimental in any way? I realize I won't be getting every little bit of horsepower out of the car that i could, but I started this project over two years ago, I just want to finish it, and since starting the build I have realized that when finished the car will probably have more power than I will ever need.
The car is a 93 z28, m6, 383 lt1 with ported trickflows, homemade kit with twin precision 61mm's. Hoping to make somewhere between 600 and 650 horse to the wheels. Any info you guys could help me out with would be awesome...
Thanks,
Mike

RealQuick

Obviously condensing 2 banks worth of exhaust into a single pipe via a y-pipe is going to restrict you (as you are obviously aware), but it should be fine for the power levels you are looking to achieve. If you were super concerned, you could mount twin cutouts on the y-pipe for max power situations. I say you'll be fine though.