Thanks for that dom, I've already got a filter here that's got a plastic surround to it and a hollow end so air can get through the filter. Is this a filter with already a heatshield around it ? Like I've said before I was given it to me by a guy who had it on his vectra 24v. Or do I still need a heatshield even with this. As I've looked on the net and only seem to find the exposed filters with heat shields.I've yet to see a cone filter with a plastic casing and also a heatshield.If that makes any sense