Performance terms, Filters, Plugs

Dear Friends,

Could somebody please enlighten me on following terms?

1. Air filters - K&N, Green Cotton filter... both are same? i had a K&N filter on my old pulsar bike...is it same in cars? any effect on performance/Fuel Efficiency?? also abt green cotton filter??

2. Plugs - Iridium plugs are better than stock?? mean with FE and Performance?? 

Can anyone please enlighten me on my above queries??? 

Seniors please could anyone help me on above??

Hi Nikhil,

Yes K&n slightly increases the accleration as fuel is burnt faster.Buttt comments on effects on engine due to k&n are mixed. 

Iridium plugs are useful for modified engines and the improvements on stock engines are marginal.

BTW which car do you use?

Hi Omkar,

'm planning to go for a used fiesta sxi soon, so just checking with these before.

Also could you please enlighten me on Green Cotton filter???

@Nikhil,

Stick to the manufacturer recommended parts. That is the best way to ensure that the engine remains fault-free. The paper air filter (which is common nowadays) is by far the de-facto air filter in almost all passenger vehicles these days.

Thanks Rohit,

But could you please elaborate on De-facto filter? whats the difference??

Nik!

Dear Nikhil,

There is no air fillter called DE-facto.The word De-facto means "The fact"in Latin.

Sorry  regretted!

Nikhil does the fiesta that you are planning to buy have these 'modifications' and is the seller charging more accounting for the same?