I just installed a K&N Filter on my 2002 Mazda MPV with 112,000 kms on it. I first observed that the vehicle was easier to start and I didn't have to press hard on the accelerator to reach the desired speed. My boss also installed one on his Nissan Maxima. He also noticed a huge difference in power.
There are a lot of people who say negative things about K&N Filters. I think they're the ones missing out on a very great product ever developed.
I might be going home to the Philippines this year, and I'll be measuring the OEM filters for my Isuzu Crosswind, and my parents' Mitsubishi L200 Strada Turbo Diesel and Toyota Hi-Lux. I hope that you will have drop-in filters for these vehicles.
Rex C. Hinlo, Calgary, Alberta, Canada