rrounds

Stick with Wix or Honda air filters. I put 90,000 miles on my Wix air filter and even with all those miles the air filter made no restriction on my restriction gauge. I went with a Honda filter when I changed the Wix out.
Here is my old post on it
https://www.s2ki.com/forums/s2000-un...ilter-1163927/

Don't waste your money,
Rod

Mr.Matchbox

The design of velocitiy stacks is very important, and the positive effects are very well known since.... the 1950s?
For example, every japanese motorcycle i worked on has the rubber tube connectors between carburetors and airbox formed as velocitiy stacks inside the airbox. Even my VW Golf MK III has a all piping in the airbox formed as velocity stacks.So this is, in my opinion, not a noteworthy detail it is just a important absolutely basic design feature for every engine.

In contrast, it makes you wonder about the "Quality" and "Performance" of some aftermarket tuning air filters when they dont have a velocity stack inlet inside.

Here is a nice, old picture i found:

windhund116

Early 1930s Formula One engine.

Mr.Matchbox

Sometimes you can HEAR pictures.