Well I've found the Hiclone to have made a major difference but in saying that there were a few other things done at the same time so it's hard to tell what difference the Hiclone on its own has made.
It is very effective as a pressure drop in the intake, which will lower your volumetric efficiency. Less power, worse fuel economy, by the tiniest bit you can't even notice. If you have a handy mate, get him to take it out of your car at a random time without telling you
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