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Old 04-16-2018, 08:26 PM   #1
Scooby Newbie
Member#: 437892
Join Date: Jan 2016
2010 Impreza

Default Exhaust leak sound but no leaks

Good day everyone, I have a 2010 Subaru Impreza with 1.5 EL15 engine JDM impreza. The car has 120k km the odometer. I had a check engine light for P0420, I believe my catalytic converter was clogged. So to unclog it I had to cut the whole thing out from the exhaust system and take out the catalyst in it because it was broken up inside and turned side ways thus causing cel. So I welded the empty cat back to the exhaust the cel is gone but I get a exhaust leaking sound only when the engine is at low rpm like 1500-4000 underload. When in park and the engine rev'ed up there is no leak sound. I checked the welds, no leak. I thought it was the empty cat acting as an exhaust chamber that's causing it so I replaced the cat with a 90 degree pipe. The sound is still there. Where the cat is located it is right after the manifold then a sharp 90 degree in this vehicle. If anyone have any idea what is the cause and if there is a cheap way to fix it because I don't want to buy a new exhaust.
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