Tip, drop in filter (k&n or pipercross for ex.), snow grate removal and tweak of factory intake using the golf r part and some dremel work is good enough if you do not go far above 500go. Tip from cts is about 80euro, drop 60euro kn or 25 euro for pipercross, golf r cover is is about 15 euro, dremel work should not take more than 1h including mount/dismount work