Thanks for all the great advises from everyone here.
I eventually bought a CAI from Ebay. Cuz there was a guy who bought the wrong intake and sell it $50 less than it's orgininal price.
I figured out it might be a once a life time chance! haha
It took me around 1hr to install, it wasn't that hard, but it takes time.
The sounds is awesome which I would recommand to anyone who is considering buying a CAI.
I could also see the acceleration is being improved a little. My car always has a delay start, and the CAI somehow improved it.
The mpg is being improved a little. I used to have a 19~20 mpg, and I have around 20~21 mpg. It's not a huge difference, but the gas price is getting higher everyday. It safisied me a little.
I'll post some of the picture of it. I will record the sound of acceleration next time for those who is considered putting on a CAI.


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Looks really nice!

 

The V2 is great. I have one myself.