K&N Air Filter vs OEM Filter - Diesel

K&N filters may give power gains to performance cars but I want to find out what it can do to an average 4 cylinder diesel engined family car like mine.
In this video I test the K&N filter and the Lexus OEM filter over a range of speeds in second gear third gear and four gear to see if a less restrictive air filter translates into increased acceleration.

[@colincrooky]

When I was a young lad (18) I decided to look at my air filter on my trusty Moggy Thou. It was absolutely clogged and since I had just graduated from Army Apprentice College in 1968 I thought I was adequately qualified to change it.
However, I did not have one at hand so I just removed the old one and drove on. Wow! It was brilliant, like driving without Choke (remember that knob that you had to pull out to start the engine?).
The economy also shot up of course.
So why put another filter in, I wasn’t very well paid so it made sense and I did not live by the sea to pick up that nasty course sand in my engine.
I did grow up eventually.
Great video thank you.

[@jokerii67]

When you put new K&N filter in, you must oil it first.

[@EduardHaz]

Don't floor it under 2.5k rpm the turbo struggles to spool and this will damage it