I'm not going by manufacturers dyno's but ACTUAL experience..I started out with the Z-tube/PC and it sounded great but was very sluggish in hot weather...I tried it with both the heat shield and without the shield...no difference...I switched to the Nismo CAI and felt a significant difference at the top end and in warm weather...Could be placebo effect, but I doubt it...the filter position is so much different... As for dyno charts, beware of manufacturers BS, it's all marketing...
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