If you have a diesel then an induction kit won't do much for it. It's all done on air flow metering and ecu values. Best thing for diesels is remap and/or big turbo. If it's going on a petrol engine, then either or will make a difference.
 
i havent got either so i cant say but im going to get a dynatwist filter.. i had a pipercross filter and it killed my airflow meter and cost me a 100 to get fixed..what a waist!!!