Induction kits are a matter of personal choice, some make more noise, some not as much, some are way more expensive than others. The pumaspeed ultimate and DS kits are open cone kits which will give a larger induction noise but are ultimately more expensive. Closed CAIS kits such as those offered by Auto Specialists will not make much more noise over the standard induction but still provide a performance increase. I personally have the Auto Specialists type CAIS since I got it for a decent price but imo they are all as good as each other just personal preference.