NSR / Exausts

[Scotty]

Could anyone tell me a few Exausts that give a better performance from the bike? (NSR125).
I'm not bothered about the Price i just would like to know what you recommend?
Or have any comments on what you have on the bike?

I used to have an Arrow system onmy scoot which just pushed the bike from 48mph to 57mph on flat.....whoooo hoooo.

Oh is there any bigger top end cylinders and heads you can get on the NSR? maybe a 160cc or 180cc??
I not sure the actual sizes. But this info i'd just like to know about. I dont think ill be doing it right this moment. i only have just got the bike. but it would be nice to know a bit of the tunning aspects for the bike?

Oh if you do change the barrel and piston i head there can be over heating problems, is this true??

Thanks Very Much.
Scott