There's more to it than just that. A crossover of some sort was primarily useful for odd firing engines. Even firing ones like ours don't benefit much, and I'd bet the HP difference is negligible. They do usually yield a different sound.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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