Is that an oval or the red round Cherry Bomb?
For me the y-pipe on these things is a power robbing POS. I've thought of a 1 inlet/2 outlet oval Cherry Bomb with two pipes going back. the sound might be there but for all the work, little power gain.
With all these things on the road, someone has to come up with an improved system.
BTW, I've got the oval CB on our Miata, works great.