bar sliders go on the end of your bars and are there to hit the ground when you come off your bike. they hit the ground to protect the rest of your bike.
i have used the torquer exhaust thingy, it is ok. i would throw it on any piston port engine i have, just for a little bit of extra kick.
im not sure about the supercells, i just use boost bottles from
Nitrous Oxide Kits . theyre cheaper because of the materials used, but im sure work just as good, if not better.
and i also wouldn't recommend using PBU for parts because they are overpriced, they have crap service, and ontop of the high prices, they charge a very high cost for shipping. i bought blackwidow reeds for i think $40 off the top of my head, and they charged an additional $40 for shipping. buy parts off the forum sponsors. they are ten times better than PBU in every way.
cheers,
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-SQ blata rep (47cc big bore kit, 19mm dellorto PHVB, Blata reeds, Blata crank, Zocchi Rep Pipe, 7mm reed spacer)
-911 rep (BZM 50cc 6 port top end, bzm bottom end, bzm 40cc pipe, BZM red crank, bzm gold head, BZM 18mm carb)
-D1 (50cc 5 port polini rep engine, 19mm del rep carb, bzm 50cc rep pipe)
Email: nossta_nossta@hotmail.com 
