Yes a common topic
but ive searched audiworld forums and still end up with "???"
What is the best Air Intake mod?

Air Box Mod - this was talked about but, people said it did worse, or they didn't gain anything, or what they ended up gaining wasn't worth it
here's the link: http://www.europeanspeed.com/stage2.htm

Carboino - This one looks really good, could use a cover, but the sound was increased, and the power also was increased
link: http://forums.audiworld.com/a4/msgs/2367895.phtml

I know Neuspeed makes that "larger" intake pipe, but for the money, it looks like it would add as much air as adding stickers to your car

also ive seen people just make the cone filter, and a bent piece of pipe, with a sheet metal barrier, which would seen to use the air from the engine bay more than anything, and not really benefit because its not sealed


Someone was also talking about removing the screen on the MAF sensor, i have no clue about that, so what is the most cost effective intake mod for the 1.8T and acctually letting Cold air, get to the motor?

Carboino looked the best in my opinion

 

Best CIA is your stock one.
It wont do anything for you execpt a whoosh sound which some like.
Not worth $300-400. But if you have $ to burn , Hells yea!

 

Carbonio is nice, I'm sure, but totally not worth 380$. Get a downpipe or something if you have to spend that kind of money on performance.

 

Your not really going to see gains with intake till you have a ko4 or bigger.