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Old 08-10-2019, 10:26 PM   #1
yarisito
 
Drives: 2009 Toyota Yaris
Join Date: Oct 2016
Location: SoCal
Posts: 5
Improve mileage or horsepower on 2009 Toyota Yaris

My car is stock. What upgrades can be done to improve either the power or the fuel economy?
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Old 09-12-2019, 09:17 PM   #2
knobby bobby
 
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Drives: 2015 Yaris Coupe
Join Date: Jun 2012
Location: NY
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I removed the stock air filter and installed a K&N air filter and it improved gas mileage and performance. The yaris is meant to run with the stock muffler. A fart can will loose back pressure and power
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Old 09-24-2019, 09:56 PM   #3
MadMax
 
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Drives: 2008 Yaris Liftback (Sprocket)
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Location: San Antonio, Texas!
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Quote:
Originally Posted by knobby bobby View Post
I removed the stock air filter and installed a K&N air filter and it improved gas mileage and performance. The yaris is meant to run with the stock muffler. A fart can will loose back pressure and power
That same "high performance" K&N is letting in a substantial more about of dirt and other particles into your engine. In the long run it's a bad idea.

As for performance out of a Yaris, it's an economy car. If you want performance, buy a sports car or just drive your Yaris as fast as it will go and enjoy the ride!
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Old 09-25-2019, 07:53 AM   #4
myfirstyota
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Performance: 2zz swap
Mileage: slow down, drive less
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Xd/2zr-fe Swap/Build Thread
http://www.yarisworld.com/forums/showthread.php?t=61427

Bolt-in 3.75" Suspension Lift Build Thread
http://www.yarisworld.com/forums/showthread.php?t=61577
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