What's the difference?

First pipe is a mid-top end pipe. It would be better for a dune or drag set up. The high volume is more suited for trails and mx applications
 
Thanks!

80% of my trails are straight and fast so I'd like a mid-top end pipe. But would I need the big volume pipe for a stroked 200cc ported jug? would it respond better to those mods?

I never ran the mid to top pipe, but the high volume is great, imo. Your pipe choice is going to depend on your port job. The high volume will work with more of a dune port but it isn't going to run like it should and vise verse with the mid top pipe. Deside on what you want as far as porting goes and then get the pipe that will compliment it. I've never heard of anyone being unhappy with the high volume pipe.
I ran my high volume pipe on a completely stock motor and the mid range was awesome, adding the port work, big bore cylinder, stroker crank and bigger carb just magnified everything considerably. Thats the easiest way to put how the power felt.