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post #21 of (permalink) Old 06-14-2014
SHELBY GT 350 Member
Sharad's Avatar
Joined: Nov 2010
Location: Fort Myers
Posts: 6,462
I'm at 10psi on my 2011 5.0 M6 with Roush mufflers. Yep, it's loud at WOT, but I don't mind it since the bite matches the bark. Anyway, GT500 mufflers are a good option for someone who wants to quiet down the exhaust.

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