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have a standard throttle body on my zr but how much more power will i acheive if i upgrade to a 56mm one? Anybody tried
 

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If the engine is standard then nothing in reality, all that you will gain from a larger throttle body is a slight increase in throttle responce.
You will only notice/see a difference in actual engine performance when it is fitted in addition to a larger quality air filter enclosure and exhaust system along with an engine remap of the ECU.
 
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