I've been using the air filter for a long time, changing it is fun, easy, and I can feel the effects.
First of all, the slight sluggishness when starting from zero has been reduced and the body feels lighter even in the load range.
The improvement in fuel efficiency is probably within the margin of error, but I think this is the best.
When the 1st stroke is fully open, you can hear the intake noise.

The next thing I installed was a suction kit, which is also a standard feature, but I felt it didn't really suit the DJ5AS. This is because the SKY-AT is already a very well-made product.
With this installed, the response during acceleration is improved to something that previously felt a bit forced, but as mentioned above, I began to feel something was off with the highly refined AT and shifting algorithm.
Shifting down is easy to understand.
The RPMs are rising a little too high and I'm experiencing shift shock. I'm worried about the lock-up clutch.

For installation, I used the band on the induction box side for the Mazda3 20S.
Perhaps due to an error, the existing screws were too small and could not be tightened.
I tinker with it as much as I can, experience the effects, and sometimes feel the high level of perfection of the original...I've been using AutoExe for over 20 years now, and it's always been fun.

●Hiro from Okayama Prefecture (Demio/DJ)