I'm still umming and arr-ing about improving the induction on my ZR.
Obviously, an open cone filter is out of the question, as I dont wish the engine to suffer form heatsoak. Its only a 1.4 and doesnt need slowing up off the line
I noticed that PTP are offering ITG induction kits - but they're a lot more expensive than just a filter, I dont know of any alternatives though.
I've also lookup up panel filters, X-Power were offering the 'Green' filters for £45, but it costs about £55 to get them delivered from Green. Its also nigh on impossible to find them for a ZR in places like Halfords!
I've already taken the 'cone' out from inside my air-box, which has added to the induction roar, but looking back I am unsure if it has made a huge difference to my performance...