I have the cone filter on mine as of about three days ago and a spit back on the rolling road
Due to the problem of heat sink under the bonnet, I have left the bottom of the air box in place with the cold air feed going to it from the grill.
It sounds nice, not as offensive as the one I fitted to a 1.7.
Good for a couple of BHP I think.
Mine ran up on the rolling road at 159.7 BHP with the K&N panel filter and the Pumabuild Piper FRP exhaust.
Then 198.8 BHP with Nitrous oxide switched on
So with the cone filter, I should be just over 200 BHP
Couldn't think of a cheaper or easier way to get a decent boost to the cars power, than NOS....