It was about 6 hours of work on Saturday and another 5 on Sunday from start to finish with lunch breaks and mini breaks in between those 11~ hours. I wasn't in a rush either and wanted to do everything properly because I definitely did not want to repeat any steps. I also had help from a good friend of mine so that was nice to switch off if one of us couldn't get something off or get into a tight space. There definitely was a lot of tight spaces.
The biggest pain was the front passenger axle and getting your hands and arms around it to undo the v-band clamps on the downpipe and turbo housing. The clamps were stuck on there super tight and it took a few tries to get them loose. Putting them on was a bigger pain, but overall took less than removal.
O2 sensors were also kind of a nuisance, but we got past them. Dropping the subframe was a lot easier than I thought it was going to be. Literally 3 bolts on each side and then the 2 motor mount bolts and it was down and it at first doesn't seem like it goes down much at all, but it made a huge difference in removing the factory pipes. Still not sure what is so different with the xDrive subframe than the regular RWD subframe, if there is a difference? Or does the additional components of the AWD system just make it harder which results in dropping the subframe?
One thing I did discover was I have a leak somewhere down there. Bunch of dirt and something wet is on the front diff that is somehow connected to the oil pan? Looks like a very heavy duty oil pan on this car. Something is definitely leaking and it won't be fun to replace, but I'll check it out.
After this whole install situation I literally feel like I could get through almost any car repair.
Downpipe install on 335i xDrive - wow
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