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Cat Delete question


scratch

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Hello

 

Car is 2008 S-GT manual with twinscroll turbo.

I've recently had a 2 1/2" exhaust put on from the second cat back. My problem is it still sounds constipated. What I want to know is do I have to get a tune after removing the back cat? I think it has either a co2 sensor or exhaust temp in it.

And if I have to get it tuned does anyone know of someone in the Manawatu that does etunes/relashes?

 

Thanks

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Just to clarify what you've done here, you've had the whole system replaced from the second cat to the mufflers? And now want to remove the front cat (nearest to the turbo)

 

You'd want to get a tune if removing both cats or have the ability to monitor it for an extended period to make sure it's not overboosting a heap which it probably would with both removed

 

Pretty sure those S-GT's use the same turbo and exhaust setup as the 4th gen Legacy's so it should be able to get a decent bump in power with a tune.

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2 hours ago, Andy_Mac said:

Just to clarify what you've done here, you've had the whole system replaced from the second cat to the mufflers? And now want to remove the front cat (nearest to the turbo)

I've still got both cats as exhaust place couldn't be bothered removing the second one. item C in the pic in this link:https://partsouq.com/en/catalog/genuine/unit?c=Subaru+Japan&ssd=%24HSU-egsEBQcBBAcVDDkDAgQETGx0TCIEIVBbc2NfXwwX%24&vid=1101&cid=1&uid=13571&q=

2 hours ago, Andy_Mac said:

You'd want to get a tune if removing both cats or have the ability to monitor it for an extended period to make sure it's not overboosting a heap which it probably would with both removed

So the only issue with removing both cats is over boost? how much is too much?

I've got BTssm app which I use for monitoring and it also has logging as well.

2 hours ago, Andy_Mac said:

Pretty sure those S-GT's use the same turbo and exhaust setup as the 4th gen Legacy's so it should be able to get a decent bump in power with a tune.

I have heard this before, sounds good.

 

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3 hours ago, scratch said:

Bump

If I delete cats and it overboosts how much overboost is dangerous on stock tune?

Pretty robust engines man- My GDB spiked to like 25 or something today after a new 'zaust
, just have a bit more jandal control until you can get it tuned for that. 

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