Yep, that explains the noise

"SaigaShooter - He's got an Impreza" (saigashooter) 09/25/2015 at 11:50 • Filed to: None

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Cat separated from the rest of the exhaust, holy balls is it loud right now. Felt very sorry for my neighbors on the rest of the drive home.

Seat Safety Switch > SaigaShooter - He's got an Impreza 09/25/2015 at 11:53

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Time to learn how to use a split flange, the most overengineered solution you can apply to a ghetto exhaust repair while still being ghetto.

Mattbob > SaigaShooter - He's got an Impreza 09/25/2015 at 11:58

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but how much more power does it make now, dude????

jariten1781 > SaigaShooter - He's got an Impreza 09/25/2015 at 12:07

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I was in a parking garage the morning after some turd went and cut-off all the cats from everything with enough ground clearance to shimmy under. Place was loud.

SaigaShooter - He's got an Impreza > Mattbob 09/25/2015 at 12:17

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Less than the internet said, would not recommend.

SaigaShooter - He's got an Impreza > Seat Safety Switch 09/25/2015 at 12:18

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I think that requires that both pipes still have some remnant of flange attached to them, this has a corroded rusty pipe with no flange, and 2 rusty flanges on a slightly less rusty and corded pipe

Seat Safety Switch > SaigaShooter - He's got an Impreza 09/25/2015 at 12:34

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Yeah, I’ve only ever used a split flange when there was “some of” the flange left on both sides. You don’t need much, but you probably need more than you have.

Beer can and hose clamps trick might work to get you down the road if you can get enough texture on the pipe for the clamps to grab.

SaigaShooter - He's got an Impreza > Seat Safety Switch 09/25/2015 at 13:32

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I’m tempted to just get a section of pipe, 2 lap joints and then hack off the remaining flange and the bad section of pipe and then connect the new piece to the old pieces with the lap joints and copper rtv gasket maker. I really don’t want to spend any money on this thing.

In my youth I replaced the cat with a simple downpipe, (which I now regret) and as a result it has no rear O2 sensor, which causes the heater control circuit to get all wonky and provide minimal heat in the winter. a proper repair is a cat, O2 sensor and the appropriate gaskets, but it’s really more cash than I want to spend on this thing.

Seat Safety Switch > SaigaShooter - He's got an Impreza 09/25/2015 at 15:15

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Oh, I see. You’re an advanced hack mechanic.

My mistake, sir. Proceed!

I always thought the heater control circuit was a heater on the O2 sensor itself so it can start reading properly (it only works within a given temperature range), not anything to do with climate control. You should look at the thermostat and remove it if it’s a parts store POS.

SaigaShooter - He's got an Impreza > Seat Safety Switch 09/25/2015 at 17:39

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You are right, It would make far more sense if the O2 sensor had nothing to do with HVAC, not sure how I drew that particular connection... My knowledge on the subject isn’t terribly deep. Also, no need to use “hack mechanic” adding mechanic after hack is giving me far too much credit.

Seat Safety Switch > SaigaShooter - He's got an Impreza 09/25/2015 at 22:59

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You might also want to find the heater hoses and give them a good squeezin’ to see if they’re getting hot like you expect them to.

The heater core may also be blocked, and depending on the car that’s either an easy problem or a NASA expedition to Mars.