Large KN Sport air filters in 4 "- for turbo etc.
Here are very large air filters for mounting on eg turbochargers that need plenty of air. Have you mounted a turbo for instance 500+ hp. there is often 4 inches of access to them.
KN air filter with great effect
If you need to make lots of power on your race car, it also requires a large air filter that can float lots of air without the great resistance. Below you will find the KN filter with large connection which is often used for cars with a large turbo mounted. To keep the effect up for the entire filter life, you can buy a cleaning kit for kn filter , it removes dirt and dirt and included oil which the filter should have again after washing.
Connection tubes for these air filters are 102mm. / 4 "