Lower intake boot replacement?
 

I'm wanting to replace my intake boot while I'm doing the alternator but it looks like the hardware is pretty hard to get to from the top side of the motor. Have any of you changed this before? Can this be done with jackstands and trying to access from the underside? I searched for a DIY here but didn't find anything specific to this job. Any suggestions are greatly appreciated.

You will have a little more room if you remove the DISA Valve.

Thanks for the reply, upallnight! I'm not exactly sure where the DISA valve is, but I just finished the job successfully. :D

I will say it helps to have small hands... Hardly any room at all in there. In my case, I was able to do the job completely from the top of the engine. I read somewhere that some folks were using a lift to access the clamps from the bottom but it was not necessary for me. The only real parts to get to are the adjustment screws for the two clamps on the boot but if you can get tools in there from the top it's not impossible. I actually found that removing the larger intake boot clamp first allowed me to gain better access/angle to the smaller upper intake boot 'bellows' hose, because I could then move the boot around some. The only way I could get the larger clamp off was to use a very small 7mm crescent wrench moving in very small intervals because of the limitation in space and installation angle of the clamp. It took a long time to finally get it loose, but after that I was able to move the boot out of the way a little to allow access to the smaller clamp. After that I had enough room to use a 1/8" ratchet and extension to get to the adjustment screw for the small clamp. Reinstallation presented the same challenges but by then I had enough practice to know exactly how to position the tools :)

You can see the clamps to the intake boot once the Disa Valve is removed. Two torx screws and unclamping an electrical connection is all that is needed to remove it.

BMW Z4 DISA fix - check yours before your engine grenades! - YouTube

Thanks for the link, upallnight! I'll remember this the next time I have to get in there.