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Old 04-20-2011, 12:14 PM   #10 (permalink)
Motordyne
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Here is a sound and dyno comparison by TAC-M. The comparison is on a 350Z but it should relate closely in both relative sound and performance differences.

Motordyne resonated Y-pipe ( XYZ ) - Sound - MY350Z.COM Forums

Dyno results posted on page 2.
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