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The latest Turbo Magazine tests like 10 or 15 axle back mufflers (not a entire turboback) on a WRX. Turbo magazine reports gains of 13 - 15 hp on some of these mufflers. Is this a realistic power gain for just a muffler? I have always thought mufflers were just for the sound and looks.....
 

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it was catback not axle back
 
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