i present to you made from old chopping board a prototype of a cold air intake to match up to the factory airbox on a RB25 Det neo s2 Stagea
I'm just using foam just to keep it of the bracketry for the high beam and bonnet latch
but just from testing the throttle response seams to have improved but cant be sure its just placebo going to drive with it for a while to see and if I do feel it is worth while I will look into making a more permanent solution
ps. got the original idea forum this forum post when looking for replacement foam for the air box (http://www.r33gt-r.com/2009/04/breathing-better.html)