i have the berks with my hks...i had no cel issues. if you get one,i think the best bet is to go get the car tuned....which you shhould do at somepoint in time anyway if you really wanna bring the z to life.
as for the hfc's being diffrent...unless you get one that has a resonator in it,exterior they all look the same,its the internals that matter. as mentioned above.
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