ive been though loads of different set ups on my engines and found out the following...
k-tecs relocation kit is the worst for power, it sucks in hot air from the radiator, the inlet length is FAR to long so the engine looses torque. pulling away on a hot day is really bad, car judders due to heat soak and lack of torque.
open induction kits wont increase power no matter how many cold air feeds you have due to the fact they still suffer from heat soak.
imo the best setup is standard airbox, pannel filter, ditch the standard cold air feed for something wider and run it to the standard location, this way its easy to route, short and the standard location is seperated from the engine by the battery surround and has a air duct behind the grill taking cold air through the grill to there.
i cut open my air box and modified it by removing the 2 chambers that allow the airbox to hold the same amount of air but without giving a loud induction noise and cut a lot away to make it much more free flowing, i found this to give a massive induction roar (more than any induction kit i tried!) and gave a good performance increase.
at the end of the day NO air filter or induction kit is going to make your 1.2 faster, but choose the right setup and you will notice a difference to the way it drives! so i find it best to stay cheap with the setup, but i know middo had good results with a pipercross viper but at the end of the day its a lot of money for low gains.