I'm not familiar with those pipes, but on my hfc's I had a rattle from a loose plug that caps off the O2 sensor bung. Just make sure, cause this is so easily overlooked.
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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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