The Quaife QKE6U Sequential Gearbox has been know to weep oil from the original breather bung.
To combat this we have produced a breather kit which mounts in the left side strut tower on Evo 4-9. The system incorporates all the fittings, hose, and hardware needed to fit.
Simply remove the original breather bung and install the adapter supplied. Run the hose from the gearbox to the Radium air /oil separator then vent the can under the car (taking care to stay away from the tyres) using the supplied hose.