How much of an effect does air filter size have on things? I have this K&N at the moment but am considering ram tubes with sponge filter socks.
 
 

I run the 83mm version of that K&N with ramtubes inside them.  I think the ramtubes are about 35mm long so plenty of room.

I mean restriction from the filter element. Yours is a much larger element therefore more air flow. I just heard someone say to me that it makes a difference if you use a larger air filter compared to small.

I have no personal experience with them but I have read in many threads and sources that foam filter socks are bad for airflow into the carbies.  Upsets it too much.

On the dyno socks on the trumpets cost me 8HP so I haven't run an airfilter since.
 
But my esky is trailered to and from events and I mainly compete in tarmac sprint events against the clock (i.e. no other vehicles around kicking up dust etc)

great info. Thanks

Dellorto recommend that you have a minimum of 25mm around the ramtube for clearance, so i guess that counts out socks.
 

Socks are a huge no no!  Not only do they flow crap, but the way they are mounted upsets the effect on the ram tube.  Last Pinto I dyno'd dropped 8rwkw (yes, we double checked it, it was that much) when the socks were fitted, and I've done heaps of other engines with the same sort of effect.
 
K&N's are good with a ram tube underneath.  I recommend the entry of the tube to be a MINIMUM of 40-50mm away from the filter top.  The other method that works well is the box type arrangement with tubes underneath, as long as you can feed it enough air. 
 
Cheers
Woz

looks like i'll be needing something like this then

ratta tat tat

looks like i'll be needing something like this then

 
Whats the longest air filter you can fit in? (or thickest in other words)
 
Woz