I do know that the Z1 post MAF tubes and drop in K&N air filters will get you about 80% of the gain on the dyno you would see from installing a full length cold air intake kit. The best 100% gains on the dyno I have seen from a full length cold air intake kit in my experience is from the Z1 Motorsports full length cold air intake and the Stillen Gen 3 full length cold air intake. It’s your Z and your choice??
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