have a friend with a S2 who bought a cone then took it off 2 weeks after because he felt power loss.
i only went for a cone when i had the T3 fitted so cant say myself.
cone filter sucks in all the heat from the engine unless you build a heat shield around it. for a T2 id always us the std airbox with an uprated panel filter and drill a couple of holes at the front of it to aid air flow. it looks tidier too
hth
Gav