Ya know, i'll be honest, I just think the VQ37 in general is just a really quiet engine, seriously. At idle, with various exhausts i've heard, it purrs like a kitten, HFC's or not. You can barely even tell the car is running. I was excited when i first put my Stillen exhaust on because it was loud and raucous, then after a trip to albuquerque, it burned in and quieted down considerably, pissed me off really. I think the only way you'll get a loud sound is with the long tube headers and no mufflers.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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