This air filter insert from HI: PE is an obvious choice if you want to increase the air flow in the filter, but at the same time preserve the original air filter box and appearance. The filter consists of two different types of foam in their own layer, one large-mesh and one fine-mesh which ensures an excellent filtration of the air. When switching from original or standard air filter insert to one with more air flow, you may find that the machine requires more petrol as more air comes in. In order to maintain the right mixture, one therefore needs to check whether it is necessary to re-inject its carburetor.