This is my impression of replacing the Mazdaspeed air filter.

good point
You can now hear the intake sound more clearly and feel that the intake resistance has been reduced.

Bad point
Difficult to install anyway.
I tried hard, but in the end I couldn't install it myself, so I brought it to Mazda and had them install it for me for a fee.
Even Mazda said it was quite tight and they had to force it.
I would like to see improvements made to make it easier to install.
Recommended only for those who are confident in their installation.

●Tokyo Tusk-san (Roadster/NC)