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Gonna bump this old thread to add some insight from my recent install since there’s not a ton of DIY install info for B46 downpipe, and there are some differences from the B58.
From up top, you have to twist the O2 harness out of the bracket before you can disengage the plug and then loosen the turbo side v-clamp with a 13mm. You’ll need to use a screwdriver to open the clamp enough to remove it. Underneath the car you’ll need to remove the exhaust side v-clamp and the two 13mm bolts in the bracket that holds the OEM downpipe in place, the inner (driver side facing) bracket bolt is a bit of a stretch to reach. For me the removal took much longer than the install haha.
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