Boxer Rumble

What makes the boxer rumble sound?

Everyone loves the boxer rumble that comes from WRX’s, and even our BRZ, FRS, and 86’s. But, what makes that sound? Why does a stock BRZ/FRS/86 not have the boxer rumble? In this video I compare the exhaust sound differences between an unequal length style header to that of an equal length style header. Which exhaust note do you like best? If you would like to know more about my BRZ exhaust system setup, take a look at my ACE A-350 header installation video.