The SST is a good pipe. It has a wide range of power. Unless you get into more modding, or plan on going back to 2 carbs, changing pipes would not benefit you at this point in time. The 2-1 is ok for trails and stuff, but it is limiting.
Porting is where the power is at. So it all depends on what type of porting has been done. I have never heard or seen anything like that. I hope that whoever ported it, has a steadier hand than whoever etched it.
How does it run? Are you wanting more power in certain areas (low, mid, high)?