These gains seem right on to me. The z1 manifold picked up about 11 hp peak over the m370. The m370 loses about 7 hp over the stock manifold on a full bolt on car. So lets say z1 picks up 4 over stock, and syn picked up 6 on a hfc car, which is great considering the z1 car had headers. Its just a ported intake, don't expect miracles , if you want the last little bit out of these cars this is a no brained. People spend more for an m370 to loose peak power. Oh I forgot m370 makes more under the curve, which doesn't matter after 1st gear.
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