Hi I have just swapped the front sprocket on my pulse, to reduce the revs at 50mph from 8k to just over 5k, the part is here http://www.wemoto.com/bikes/Suzuki/E..._Plus_2_Teeth/

It has made all the gears more usable, first was far to short before, plus now 5th is more of an overdrive in normal use.

I also changed the end can for a yoshimura replica from eBay found with this item no. 290522993270

The sound is much louder and has a crackle and pop on overrun, it revs freely as the cat is removed with the old end can, just needs more fuel as the revs flatten out at 6k.

The fuel mixture has leaned out and needs to be up jetted, it has a drilled out 97.5 main jet in now, and I am not exactly sure what size to go to.