Anybody here installed stock replacement K&N air filter. I know many of you here have cold air intake but I'm just willing to replace the stock filrter with drop-in-replace K&N one.
Any info is apreciated.
I feel the K&N Stock filter drop in is a better than cold air intake kits such as APR, especially stock engine.
I have both ( APR and K&N panel filter) and in stock TSI engine, i found that if you use cold air intake you will achieve better top end performance ( between 4000- 6000 rpm) but you will loose low end torque.
but in K&N its best of both worlds, you will get good lower end and top end performance.
I have not done any dyno , this is only my opinion.
Oiled cotton gauze filters poorly, just hold one up to the light. Dirt, in the form of silicon gets into the engine and there is no fuel wash over the valves to clean them off, deposits are guaranteed. Filters actually do their job better with age, as progressively bigger pores get filled up, filtration gets BETTER.
Also guaranteed is excess wear, esp the top-end, tin and chrome from rings, maybe some copper shed.
Why do you think all those ricemobiles blow smoke? Hammering it before the engine is FULLY warmed fugs it up too.
Widman summed up his experience with excess air filter nonsense in a short study...