The best bang for the buck will be the test pipes. I like the resonated fast intentions test pipes. Between the intakes I'll put it like this. I have three friends with 370zs. Two of us have the stillen intake, one has the z1 and one has the aam. The only one with fitment issues was the aam and it was pretty bad. One of the pvc hoses would barely reach the motor and the other one would not reach the motor. He had the motordyne exhaust art pipes plenum and aam intake with ecutek tune and made less power than my buddies with the stillen intake fast intention exhaust test pipes and ecutek tune. If I were you I would go with either z1 or stillen but after seeing both the fitment issues and how little aam seemed to care about the issues for my buddy I won't be buying any of their products. I hope our experience helps.
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