I actually doubt you'll see even a single mph higher on trap with a cam swap on stock unported heads. It's just not going to add any hp to heads that actually lose flow above .500 lift. The stock cam already runs lifts equivelent to near max flow production on the heads.
You can get a cam for sound, but for performance, I doubt you'll see any gains worth mentioning until the heads are worked on.
Between the B cam and the E cam, the B cam will sound more badass, and it'll produce more hp in the higher revs, sacrificing low end to do it.
To each his own of course.
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