zaki said:that's true but it's not a common practise here. ppl PnP their intakes until they shine like a mirror. the rough surface will create some turbulence and the fuel will atomize better.
it is not the extractor alone. the camshaft overlapping oso have great impact on the scavenging effect as well. plus the overlapping is tuneable while the extractor is not...
do u think that cam overlap can make the vtec sound different?