they are useful but getting an air intake can boost up ur rides hp but for that u should also need performance plugs and plug wires to atleast feel a difference...
but my advise for u is if u really want to mod ur ride and if u have enuogh time and expertise to serve ur car day n night then go for these cool stuff mashAllah at our pw we have lots of members who dedicated themselves to their rides and opted great master pieces out of their random rides hats off to them..
but it seems that ur car is full stock and wat u want is just to increase more power without detailing into several mods.. so my sincere advise is better to stick to stock but if u want slight boost then change ur air intake with an afer market performance air intake, spark plugs and plug wires. i hope u ll get wat u want...
general price quote is,
air intake filter cone : 3000 to 4000
Piping and hoses: upt0 2000
plugs: around 4000
wires: 3000
as this is general estimate i dont know what are actual market rates here in pak as i m abroad since 5 months.. but just make rough budget sketch and then go for a window shop to confirm prices and finally bargain and get them install hope my comments wud help u..
happy motoring..