I have a 2014 Raptor and would like to know what would be the best aftermarket muffler to give me the deepest, loudest sound being most important but along with performance. I have looked at Flow master series 50 hd online. any suggestions.
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A 21 percent increase from merely removing the muffler is not within the realm of possibility, not if you're talking about the stock Ford muffler. The stock muffler is a little heavy, but it's a very good design. I replaced it with a Magnaflow #12388, which is a straight-through design, and it didn't change my fuel economy one iota. I'll never believe the 21 percent claim.
How do you like that mf? Any drone ?
Geeeeeze. Please stay off my side.