Average Reviews:
(More customer reviews)I'm running one of these on my wife's 2004 Mercury Grand Marquis (2 valve 4.6L V8). I removed the secondary catalytic converters (the primaries are still there and it still passes emissions, so calm down) and made a 2.25" y-pipe merging in to a single 3 inch pipe, exiting out the back in the stock location (albeit with a much larger pipe). I have regular 40-series mufflers on two other cars (one dual 2.5", one dual 3"), and the Delta Flow technology really does reduce interior resonance compared to those. The tone is slightly different, but still distinctly Flowmaster. With the factory gearing, this muffler is not annoying at any cruise speeds between 45 and 80MPH, even with the overdrive turned off. But you can definitely tell that it's there, even in a fairly well-insulated car like the Marquis. I probably would not go any louder (ie, plain 40 or super 44) in an insulated daily driver, and this might be just on the border line in an older car with less sound deadening.
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