I've got HFC's and the ARK exhaust, and I have the exact same sound, especially on decel. I haven't really looked for a solution, but if you find out more about the header wrap idea, please post it up.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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