Help PLS!!

[wormwam]

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Ok this maybe a daft question as im not too technical minded but ....

On a recent drift day (2 weeks ago) , on my last run , I got large plumes of smoke comming out of my exhaust.

Now I wasnt actually 'mid-drift' when it happened but was steering and travelling anti clockwise resonably quickly.

On pulling back into pit area and opening the bonnet I found oil running out of my air filter (HKS Direct Drive Kit).

The engine is a mosly standard 4age - only air filter upgraded.

After driving the car out of the site (after allowing engine to cool for an hour or so) the smoke cleared and has been fine since - Over 200 miles travelled since it happened - its my daily drive so I have to use it to and from work daily!

Everything seems ok apart from engine 'Hunting' on idle.

Have any of you experianced any of these things before?
and....
Any ideas what may have caused this and/or ways to prevent it happening again in the future?

Many thanks in advance