Best online parts and prices. Be carefull of 4 into 1 pipes, they normally leave a flatspot between 3000 an 4000 rpm.
Lots of extra hp with the 2brother exhaust system. The PowerCommander isn´t really going to do much, it might give you 2 hp more. Price isn´t worth it.
Rather look at porting the bike, put a stage 3 dyno kit in, check the sprocket sizes, also look at skimming the heads. All of these will do a lot more than a PC.
If you are still not happy, look at a performance kit - includes bigger pistons and boring. There are proffesional kits on the market at round R5000.00 for all. 
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