Would it be worth buying a K&N intake, with a mass air flow sencer If I already have a cheaper intake without the air flow thing, I'm new with cars, and want to get your opinion on if I should do it or not.

 

I bought my FC with one already installed, and it works fine, but it butts up against the upper radiator hose, so no cold air intake stuff happening there. Your gxl won't run without the MAS, so you already have one. Since you already have a filter, leave it be unless you are going to race with it, and in that case, get a real intake system. blitz and hks sell race systems for FCs that are quite good.

 

You already have an airflow meter in the car, and you can't run without it unless you install an aftermarket ECU. You buy a pod filter that attaches to the AFM.