stock air filter vs. simota or K&N

[attyallanlatras]

^^in my opinion if you dont change the exhaust and headers and just rely on the k&n air filter alone, power gains will be very minimal and return of investment in terms of fuel saving will be long term. very few people keep their cars beyond 5 years and the cost of the filter itself will not be worth it. since its a drop in filter, you can always take it out and out back the stock filter when you get your car for servicing so as to not void you warranty

Thanks, so K&N is not for me for practical reasons...