I purchase one K&N air filter for every vehicle we own. I buy it ONCE. My wife's car we bought new about six years ago. It is still running it's K&N we bought back then.
Same for my three CUCV's. I also have an air filter housing mod that with the K&N air filter, you WILL get a lot more flow. That, along with replacing your exhaust system with a free flow muffler set up will wake your CUCV a lot. Then, upgrade the injector nozzle ends and you are on your way to a 'hot rod' CUCV.
Doesn't cost a ton to wake up these engines.
View attachment 228838
And don't take this the wrong way, if you've got ONE MV, then yah, I do understand the going the cheap route. But I own THREE so if I change three filters once a year, that's $15 per year - yeah it takes ten years for me to break even cost wise.
But I also concur with rod and I have never just gone cheap. I guess I'm weird like that. Can't say why.