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I have a "secondary air flow valve" that has seized, apparently its rather common.

My auto sparky has quoted me $900 for a new one.

Considering this is bloody expensive, and the valve for the other cat is likely to go soon...

Im thinking of removing all of the secondary air flow system and flashing the ecu so the codes will no longer show,

and to make better output and economy with the 3" full exhaust i have fitted.

Has anyone done this and/or knows if it will work?

will removing the air system effect the performance?

Car is an 08 grb sti hatch (2L)

Thanks Heaps!

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It sounds like it's just an emissions control valve so shouldn't have any ill effects of removed. However if you've already replaced the exhaust with a less restrictive one then maybe this is a good chance to spend that $900 on a tune instead to give you a bit more power and make sure the engine is performing as it should

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Just get rid of it ay, no one ever actually gets it replaced. It only ever runs for the first minute or so to try warm the cat up quicker, but if you've replaced your exhaust its probably doing nothing.

Will only cause problems if you remove it and don't disable the codes. And also you need to keep the atmospheric pressure sensor and get the blocking plates.

Might pay to do a bit more research and confirm whether the sti uses the same codes disabled.

How-to for Legacy's with the same system


There's your code explanation list


And that's what the block off plates look like


Edited by Andy_Mac
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