I seem to think that induction kits which draw air in from round the engine bay causes poor running especially in hot weather, i found this when i tried one on my Astra GTE years ago, other ones you can get are enclosed, i think Viper do one, these have their own pipe feeding cold air from behind the bumper so it dosn't draw hot engine compartment air in, only problem is that these cost a small fortune.
I think most people including myself has opted for a replacement panel filter to go in the standard airbox Itg are a popular one to go for.
Hope this helps