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ktec or homemade ktec seems to give noticable gains on the rollers. But in reality i think the only different you will notice is the induction roar from an open cone as apposed to a panel filter giving the impression your going faster
I made my own with a K&N filter and some silicon pipe for £35ish all new. Roars well but no noticable gain. Standard airbox is very well designed, just stick an ITG/K&N/other cleanable element filter in.