I changer my 4th&5th gears on my ITR that I only use on the track. I put the gears from the Civic VTi (European model)in my gearbox and I've been racing a full season with out problems , the good thing is that I've used it together with a Exedy light flywheel and a lowerde vtec point 4800 RPM , now on the track with this combinantion you alwas are in the VTEC zone . you don't have to reve the car to its max RPM to be in the VTEC zone when you go from 3th to 4th or from 4th to 5th.
Its realy cheap excellent mod. These gears can be ordered in the US (yes , the are available) from a honda dealer. I hade a friend in California that did this mod on his ITR and it saved him a lot of money.
If any one wants the part N° , I will gladly give them

Douglas , Belgium

 

so what are the new gear ratios on 4&5th?

 

My car stayed in "VTEC zone" with the stock gears and VTEC engagement point.