Talk:Heated air inlet
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Removal
Where heated air intake air cleaner assemblies are fitted to engines, it is a common perception that they restrict engine performance and it is consequently common for them to be removed and a more open air cleaner assembly fitted in their place. This has the benefit of a marginal increase in performance with the disadvantage of significantly increased emissions and, in some jurisdictions, making the vehicle illegal.
...I'd like to see a reference that states this results in a "marginal" increase, as well as "significantly increased emissions". A different air cleaner should not affect emissions in most cases.