I have a K&N 57i fitted to my esc cos small turbo,but i think its pretty pants actually.I was gonna put the original air box back on and put a uprated panel filter in it,or i was gonna try the pipercross viper kit.The thing is it's nearly £250 is it really worth shelling that much dosh out?..has anyone tried the viper kit?Your opinions on this matter would be appreciated.