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SD Syndicate 2004 Toyota Celica GT
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Just removed the butterfly valve from my air box. I've been procrastinating long enough, so just ripped it out in a couple minutes. Can't notice too much of a difference in sound, but i'll try it again tomorrow. CEL didn't come on, so all is good. My question is, what should I do with this valve? Anybody want it? I could sell it to you for the cost of shipping and handling.  
![[Linked Image]](https://celicahobby.com/ubbthreads/attach/profile/13694-2.jpg) 2004 Toyota Celica GT
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Probaby not worth anything because everyone had taken them off their celi's. Toss it in the trunk for the next owner incase they live in Michigan & need it for the cold winters. 
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Specialist 2000 Toyota Celica
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I still have mine installed. Would it void warranty if I was to take it off? What does it do anyways?
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It reduces air flow when its cold. Kinda works like a choak, changing the air fuel mixutre.
I don't think it would void your warrantee if you removed it.
Last edited by Haulin_A_Doo; Jul 25, 2004 6:30pm.
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Metal Storm 2040 2000 Toyota Celica
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Metal Storm 2040
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nah, that valve has nothing to do with emissions. Will not void warranty
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SD Syndicate 2004 Toyota Celica GT
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nah, that valve has nothing to do with emissions. Will not void warranty The "butterfly is a plastic part located inside the air box that is recognizable by the small white flap in the middle. This is a very minor modification which has not shown any significant power gains but results in a deeper sound when accelerating it was placed there by Toyota to help MPG by reducing the amount of air that enters the engine & to keep the car a little quieter at RPMs below 3500. 
2004 Toyota Celica GT
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Senior Member 2001 Toyota Celica GT
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whats the butterfly valve...anyone have pics? never heard of this... 
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Wheezy Joe 2002 Kawasaki Ninja 250
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Wheezy Joe
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it also steadies the idle on a GTS at low rpm's
If you remove it, you will lose vacuum pressure on the GTS when coming to a stop and the power brakes activate.
It's the reason the cars bog down to 400 RPM
To have played and laughed with enthusiasm
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SD Syndicate 2004 Toyota Celica GT
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whats the butterfly valve...anyone have pics? never heard of this... ![[Linked Image]](https://celicahobby.com/gal3/albums/inst_butterfly/DCP_0204.jpg) The white thing in the air box  Heres the uninstall https://celicahobby.com/ubbthreads/thread.f_57307_0_collapsed_2__1.html
2004 Toyota Celica GT
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So removing it will give me better sound but worst MPG?
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Member 2004 Toyota Celica
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hey diablo, could you clarify that for me, cause i have a gts; it bogs it down...me lost now
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Member 2002 Toyota Celica GT
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The MPG was about the same when I removed mines. It will be slightly louder and adds 1-2 hp, I heard...
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SD Syndicate 2004 Toyota Celica GT
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So removing it will give me better sound but worst MPG? Yep! It was there as a choke to control air flow. Fast cars have bad MPGs, while economy cars are the opposite. Let more air in, you're burning fuel faster (Need oxygen to fuel fire, same with combustion). The sound is similar to a CAI, but not as deep. Better off getting a new Intake and ripping the airbox out for more gains. 1-2 hp gains without the butterfly are  . It hasn't been dyno'd.
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So in general you should leave it on or remove it?
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Specialist 2000 Toyota Celica
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