Just wanted to share for those who are thinking about replacing their stock airbox but not sure yet.... Two words... DO IT!!!
I installed a new exhaust a few weeks ago and although the car felt it's got more power, there was no considerable change in sound. Yesterday I replaced my stock air box with a 6" K&N cone fliter and heat shield and the car sounds and feels like an angry beast.
The best thing is it sounds just like stock at idle so no one will notice anything until it gets to 3500+ RPMs.
Here's how it looks like....