Originally posted by The_Hawk
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The appropriate standards to look at would be VSB14 and under modification of engine components nothing relating to +20% max is referenced. The only provision is that any engine mod must meet noise and emission requirements.
Lastly like I said they are standards - the law is as per your state or territory.
Here's the one for NSW Jon - no reference to exceeding 20% here. Under this document provided you don't increase capacity of the engine or change the emissions system - (exhaust or cat) you don't need to be engineer certified by how I read it anyway http://www.rta.nsw.gov.au/registrati...s_nov_2007.pdf
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