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Flowmaster 815425S Out...
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Flowmaster 524554 Supe...
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Flowmaster 815425S Outlaw Race M... vs Flowmaster 524554 Super 50 Muffl...

Flowmaster 815425S Out...
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Flowmaster 524554 Supe...
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Pros and Cons

Pros1

It's nearly like straight piping, with a few baffle inside the inner edges. Sounds aggressive. Sounds amazing on my 2000 cadillac seville.

Pros1

It's about twice as heavy and 6 inches longer than my 40 series muffler. Sounds great on my bmw x5 4. The vibrating is significantly reduced. Better than stock but not too loud.

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