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has anyone done it? Any issues/results?
 

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Once the Cat is taken out the engine won't be able to attain the required downstream O2 sensor readings, you will get check engine codes and probably go into limp home mode, if the standard cat is working, and not blocked, leave it there.
 

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And is some places there's a big fine attached if you get caught without one.
most places in north american and europe :p

the cat is very low restriction compared to the rest of the exhaust. that is one thing that has changed significantly over the years.

if you really really want to....not sure why for the almost nonexistent difference it would make....you can get high performance cats that are street legal. *in theory* won't mess up your car, but nobody can say 100% for sure.
 

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slap on a test pipe in place of it, and you'll be fine

sincerely, a guy who actually dealt with performance on the 1.6L and 2.0L.
 

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has anyone done it? Any issues/results?
DON'T DO IT!

actually gonna be with a lot of issues, in the first time will be the CO 2 will increase a lot, so if your country has limits you will have some problems with the autority

in second term the sound in your pipe will be more agressive and extremly noisy and you're gonna bored in few time.

in third one, the sensors will be activated all the time

and I will continue, but please don't do it and in the long terms your engine will be damaged because all the gases won't be treated.
 

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its not going to damage the engine. the cat is on the EXHAUST! the o2 sensor downstream has little to do with fuel trim.

the issue is that its **** irresponsible and any gains are almost nothing.
 

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With a turbo you can get 10-15 more HP by taking the cat off.

Probably another10-15 by putting on a bigger exhaust too.

Then another 10-1 with a tune.
 

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With a turbo you can get 10-15 more HP by taking the cat off.
bull. years ago yes, not anymore. source please.

but really, we're talking about an accent here. the OP doesn't have a turbo, so this is a moot point.

taking the cat off is irresponsible for environmental reasons regardless of what you're driving.

let's move on from this nonsense, shall we?
 

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On the Genesis Coupe 2L you can easily get that. And I am specifically saying with a turbo. Just countering you argument that there is no gain to be had.

Environmentally responsible is arguable point. Perhaps the mileage will go up negating the relatively small emissions increase. And usually with a tune that one would have to have when modifying with a turbo will actually lean the car out as almost all cars whether turboed or not from the factory run way too rich at WOT.

Increased fuel mileage = less emissions.
 
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