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Has enyone used a straight through replacement pipe for their cat converter?

I am looking at getting one made up for track days and drags, but not sure whether to keep the Lambda sensor just behind the cat.

My thoughts are that, removing it will cause the car to run rich as it is missing a sensor and may try to run in a " safe " mode. Or if I leave it, it will cause the sensor to read worse pollution levels than if the cat was present and it may run lean.

I am currently runing a full 3" systems, PFC, FMIC, 550cc injectorsand T3/T4 turbo.

If anyone has used one let me know if you have had any ill effects, and any noticable performance gains/losses.

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the sensor in the cat is a cat temp sensor. the O2 sensor is in your dump pipe, well before the cat. no need to hook up the temp sensor, it just activates the warning light on the dash which is there to prevent you parking on long grass when your cat/front pipes are glowing red thus igniting the grass and burning your car to bits.

Thanks for your help guys,

I need to get a custom one because the car has the cat welded to the exhaust system, and I will need to get flange plates installed to bolt it on and off.

Any idea on the performance gains of doing this?

I know it depends on how effiecient your current cat is, but what has been your experiences?

i always thought it was to tell you when your cat was overheating, so you can back off to avoid damage?

steve

no, it's to warn you of all that heat in your exhaust so you wont park in long grass and blow your car up or start a bush fire.

Thanks for your help guys,

I need to get a custom one because the car has the cat welded to the exhaust system, and I will need to get flange plates installed to bolt it on and off.

Any idea on the performance gains of doing this?  

I know it depends on how effiecient your current cat is, but what has been your experiences?

Best I have seen was a 40rwkw gain. Least I have seen was a zero rwkw gain, that was with a Magic 4" cat. Pick a number:cheers:

The magic cat manufacturers can supply 3 inch reducers if you want or you can get your local exhaust shop/yourself to do it.

They retail for $500.00 or $350 trade.

Search "magic cat" and look for sydneykids comparison with a magic cat, "highflow" cat and straight pipe. Interesting stuff.

I was quoted $100 to get flanges put either side of my cat so I can swap it to a straight through one for track days as someone above mentioned. He said the flanges would be about $60 and whatever labour, they are a cheap workshop though but that should give you an idea on price.

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