Well... This is the only 4" K&N filter I have available at this time. It looks small...

Attachment 106434

I contacted one of my homeboys in the autoparts for a bigger one.

Yes that one looks small, but to know if your filter is causing a restriction you need one of these
http://www.summitracing.com/parts/WIX-24801/

ROD

How does this work?

Let me Google that for you: http://lmgtfy.com/?q...ature%3Drelated

K LO QUE,

What are your initial impressions with the new setup vs. the original FIPK piping?

My initial impression is more power

I don't personally like to talk about butt dynos, but is all I have now. I can hear less vibration coming from the intake as an indication of air coming in with less restrictions. I have a vented hood so I can really hear the intake very good. So far I "feel" the different with more POWER at the top end.

I should be scheduling a tuning secession soon again at http://www.engtuning.com/ I will compare it to dynos from before this intake.

Awesome, can't wait to hear your results. I was thinking about doing the exact same thing with my FIPK, and then a few weeks later, I see you post the same thing :)

Will you be running a velocity stack? I'm thinking about going with a 3.5" velocity stack from BPI Performance, and pairing it with an AEM filter.

I think a velocitystack will work really good in the length of these pipe (FIPK). Original FIPK for our cars is like 2 3/4", since your making the changes why not just go with 4".

After reading in here (s2ki) one thing I notice is that majority of the "power" intakes are big in diameter.

I think AEM filters are better than K&N filters.

For a velocity stack(yes they all work) I like this one, good looks and function.
http://www.turbohoses.com/velocity_stack.htm
I like the looks of aluminum and I have one(no its not for sale) and its well made.
There shop is in Livermore,CA and I've been to it a couple of times and I like seeing $200k cars being modified.

If I had the money I'd have them make me a intake like this, one that would go from 6" down to 3.5" or 4" then tapper down to the size of the T/B right before the T/B. They can route the pipe to where it would get the best supply of cold air.
http://www.turbohoses.com/genIIIintake.jpg

ROD

Glad to see people opening their eyes and trying this out. Going from the short ram like what you did to a complete cai was a huge difference. I'll be selling my setup shortly since I got the bends for my manifold the other day >=)