Seeking the DIY on rear intake manifold cover + gasket replacement W/O intake removal

Evening folks. I am going to try and replace my rear intake manifold cover and gasket to get rid of the howling and spewing smoke to save $570 in labor, and know that there are DIYs kicking around that state I can do the removal/replacement without having to remove the intake if I simply have a 1/4in speed wrench and tamper-proof torx bits. I found one that was perfect, it mentioned the Husky 1/4in driver speed wrench, but have lost it and just spent 2 hours searching. I found a few others, but their pictures and explanations are lacking. Please if someone could on here advise me on the process, or direct me to a recommended DIY link, I and my wallet would hugely appreciate it. My calypso e34 530i has taken in like $700 this month in parts/labor so far (tires, serpentine tensioner, serpentine belt, a/c belt, howling/spewing diagnosis as those parts did not fix it, and an oil change which magnified the spewing smoke), and it needs the $80 in parts for this rear intake manifold, labor quoted at $570, then I need to do the upper/lower control arms, tie-rod ends, and sway bar, then the valve gasket covers and all the various gaskets in there plus the spark plugs. I am increasingly trying to get better at wrenching it myself, door locks and windows I am good with now, but this is intimidating and if I cannot find a solid DIY on the limited removal method, there is no way I am going to risk opening up the head etc... Thanks!



Note: I just went through the full list of DIYs for the e34 segment of the forum and did not find this, so my apologies if I am being redundant and somehow missed it.

Seeking the DIY on rear intake manifold cover + gasket replacement W/O intake removal