would it be better to get the system that replaces the canister and the s-bend pipe or the one that replaces just the canister
here is the one that i want to get Two Brothers Bolt-On Exhaust System - Honda CBR954RR - Indysuperbikes
and is this a good price for the C4 Carbon fiber and here is the flange on one its way more expensive Two Brothers Racing :: Search results for all

 

I doubt you will notice any difference in power between the 2 different setups. So that being said i would get the one you like the look of the most.

 

Interesting, the Indysuperbike.com offers the X-metal pipe. I have not seen that for a few years. It is not even on Twobros site... Neither is the high mount, but I imagine that they are putting a can from some other make onto a pipe that was not made by Twobros. ?