| I have fitted a full 57mm Termi system to my 999s, and quite honestly I don't feel that the power increase is worth the
£ 1500 I spent, Termi end can would have been more cost effective giving same sound.
However I purchased the full system because it makes the bike future proof for any other engine mods I wish to do in the future i.e. Cams, gas flowing etc.
So my advice to you is if you are going to tweek the motor in the future buy a system if you just want sound buy an end can.
I have power figures from a dyno run if you want them, however I need to fax the graph to you if you want. | 
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