what is K & N filter. What are its advantages. Can it be fitted to WagonR. What will be the cost?

Go to K&N.com , you will get all the info on your particular vehicle there.

K&N is a brand. They make a re-usable filter that they claim flows more air (and theoretically gives a tiny bit more power).

When the filter is dirty, you wash it with soap and water, let it air dry, apply K&N filter oil to the filter and put it back in the car.

l am not sure what a 'WagonR' is - but you can check out their site to see if they offer a filter for your vehicle.

http://knfilters.com/

Both above are correct, but l would bother putting one on your WagonR they do give a little more power but it wo not be noticeable and it will use more fuel, stick to the standard air filter unless you are planning on upgrading more than just the filter.

l own a repair shop,and K&N is s re-useable air filter that lets air flow better to any engine its on ,letting it get better air to breath,and increasing its horse power,and gas mileage,and yes it can be fitted to any engine or car made now,and it will help it,it always does,and as for the cost,yes its worth it in the long run,,that average cost to start with is betweeen 50 and 150 bucks for one of these systems,but they are worth it,good luck l hope this helps.

hi dude i'm also having a magnificent MARUT l SUZUK l 'R' l too tried for that and can tell u that try contacting some dealer in mumbai and in gujrat u will definetely find one best of luck but tell me too as l told u the matter hehehe they come with unlimited kms warranty and r the worlds best air filters.