Because there's hardly any air going to them!
Here's a pic of our intake tubes...
intaketubes.jpg
Our initial opening is pathetic! I want to retain a stock look on both inside and outside... so now cold air intake or cone filters.
I have been searching the web for a while now and the only thing I can find that has to do with replacing these tubes are as follows.
1) Can't Drive 55 has his setup looking like this...
DSCF0587.jpg
DSCF0588.jpg
DSCF0585.jpg
2) and Anthony at TVT has done this to a c240...
http://www.tvtdesign.com/inc/sdetail/1048
Hey Anthony how about making a bolt on for use lowly Crossfire owners!