Dont do the can, you will lose about 5hp by adding a can, trust me, seen dynos that prove it, even cans that say they add2-3hp still lose power. If you run the y-pipe the M1000's are leaning out at wot, D&D has a regulator for $99 that will take care of that, but you dont need it if you get a boondocker. What I would do if you can afford it is firebreather, or bullseyes, the y-pipe and pipe, add the boondocker and you will have 196HP, D&D has the numbers posted for the settings, so you dont have to tune it yourself, granted you might be able to fine tune it to your sled, but it makes it simple.
Below shows these mods and the dyno numbers, just scroll down to the 1000's.
Whatever you decide, domination with your sled is inevitable!!!
D&D Racing Dynos