oem muffler dissection - Toyota Yaris Forums

Bluevitz-rs · 02-21-2011, 12:23 AM

That trap door is supposed to be a performance thing. It's shut to keep the car quiet and maintain back pressure, but when you floor it the pressure is supposed to open it up allowing better flow at the expense of more sound. It's a pretty good setup when it works for a stock muffler.

yaris2010RS · 02-21-2011, 12:31 AM

Quote:

Originally Posted by Bluevitz-rs

That trap door is supposed to be a performance thing. It's shut to keep the car quiet and maintain back pressure, but when you floor it the pressure is supposed to open it up allowing better flow at the expense of more sound. It's a pretty good setup when it works for a stock muffler.

when it works? lol how do we know if it works or if its failing?

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02-21-2011, 12:23 AM	#1
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	That trap door is supposed to be a performance thing. It's shut to keep the car quiet and maintain back pressure, but when you floor it the pressure is supposed to open it up allowing better flow at the expense of more sound. It's a pretty good setup when it works for a stock muffler.