03-25-2019, 12:30 AM
Join Date: Sep 2014
Location: New Zealand
I have unfortunately seen the results of K&N and other brands of "free flowing" filters on cars that were fitted in the belief that they are "better" for the car. The only way to make them free flowing is to remove some of the filtering ability. I run them on my race cars, as thats what they are designed for, and they get cleaned and re-oiled between races. The paper filter replacements, in my opinion, are the same as OEM at best, and at worst may actually cause damage to your engine.
Standard OEM paper filters believe it or not, do not actually start filtering properly until they have about 5,000 miles on them. While I don't recommend fitting a free flowing one to a vehicle that is not going to be raced, you can of course do so if you wish.
While i would like to say there was a magic instant power fix available for the j20a motor, sadly these are designed for a purpose and the engineering is such that longevity and economy is the goal. The electronics are geared towards this as well.
While there are some out there that have managed to wring a bit more out of them, they don't last anywhere as long as they can if the basics are done.
Keep it clean, fresh fluids, check the plugs and leads/lances and while it will never be a stunning performer, it will keep on running.
2015 5 dr Grand Vitara 2.4 (daily driver)
1971 V8 HG Holden with 383 stroker 9" torq lok and TH350 trans (the toy)
Mitzi RVR 2.0 (not one of my better buys)
the 2013 3 dr GV is now the off road only toy
"Dogs feel very strongly that they should always go with you in the car, in case the need should arise for them to bark violently at nothing right in your ear."
Last edited by 2013GV; 03-25-2019 at 12:33 AM.