Hi Everybody,
Am reletively new to this great forum and hence didn't want to post this message as a response to an old thread.
I got my Swift ZXi in the month of October 2005. I had a little money to spend on accessories and I wanted to fit in only those reccommended by Maruti. The dealer suggested a K&N filter and I asked him quite a few times if Maruti approved it and he replied "Yes".
I had it on for a week when somebody asked me to check directly with Maruti if my warranty will get void with a K&N filter. I did and guess what, Maruti does not reccommend a K&N filter. To cut the long story short, Maruti must have given a tongue lashing to the dealer because the dealer called me up and changed back the filter to the original paper filter and refunded the entire amount. However, there were a few questions unanswered that I am hoping that someone technically sound will be able to enlighten me.
1. If the K&N filters improve the performance of the car, why is it that none of the car manufacturers even offer it as an option? Does it require retuning of the car as the ECM is optimized for a certain Air Flow volume?
2. I asked this question to K&N directly over email and they did not have an answer as well. They replied that Car manufacturers want to make money by making us change Air Filters more often. Considering the cost difference of the Air Filters and the frequency of the change, the answer didn't sound logical.
3. How do the K&N filters change performance? Mileage, Power, the sound of the Air intake, anything else? One friend told me that you notice the difference when you do high speeds and need to overtake.
4. What are the downsides of using a K&N filter (Apart from voiding the warranty of the car)?
In the one week that I actually used the car with the filter, I saw no jump in the FE or power. But then I was mostly doing city driving and in Bangalore.
Looking forward to some enlightenment.
Sharath |