[Sosa]

Either crawford and kinetix make intake plenums. This is the upper plenum-- the upper part of the intake manifold. Basically they are a bit taller allowing more air, and both optimize airflow to each cylinder, the crawford being flowbench proven. Both have put down consistant power on dyno's, so it's just a choice. Personally, I went Kinetix because with the crawford, you have to pay for a replacement strutbar (if you choose so) and, if you want to keep your stock plenum, that also costs about $200.