Koni FSD Shock Suspension Upgrade

[Nick82006]

Subject: 2011 N55 35i E70 X5 - Premium with base suspension

7/16/19 UPDATE: Right rear bottom shock bolt is seized up completely. I was able to turn it about 360* and it wouldn't budge after that. Used heat, PB blaster, impact, 4ft breaker bar. Wouldn't move. Took it to the local dealer, was quoted $1,700.00 to replace the entire swing arm/shock assembly (w/Koni supplied by me). Its hard for me to believe even the dealer wasn't able to get the bolt out. I understand if the labor involved to drill it out was more than 1,700 vs the cost of replacement i get it. @ $100/hr, it would take almost a full days worth of work? I am considering getting a second opinion in person.

ANY SUGGESTIONS on a CHEAPER way out of this pickle?? Hard to swallow that 1 bolt is gunna cost me that much $$.

7/8/19 UPDATE: 3 corners all buttoned up and ready to go. The right rear i have decided to take to a shop and have them take the stuck bolt out of the bottom on the rear right shock. I did not feel comfortable putting any more pressure on it while it sat on jack stands in my garage. If its going to snap, i would like for it to be at the dealer/shop when it does. Local Shop quoted ~500ish for install of that last corner plus alignment.



Problem: Knocking in the front when going over bumps, metal on metal.

Culprit: Previous owner replaced passengers side shock/spring with a Monroe quick strut. The very top rubber damper directly below the top nut/washer was missing, causing the innards of the strut mount (rubber) to break free and start knocking.




Parts replaced:
Lower control arms, tension arms, upper wishbone, sway bar end links front and back and the entire strut assemblies w/mount. The stock springs were used.




Progress: Front is 80% complete, just need to put everything back together and button up before final tq down. The rear however has been a PITA. I have searched high and low on this forum, others, youtube, BMW TIS and i cannot find the answer to the bottom nut which screws into the rear hub. The bolt is extremely difficult to turn, i am using a 4 foot long breaker bar and my fear is im going to snap this bolt off. Impact gun didn't do anything (not at 500ftlbs), its got plenty of PB blaster now for a couple days. i have made progress but they seem to be getting tighter as i unscrew. I feel like there is major tension on the bolts and i have seen conflicting procedures on how to remove these shocks.

I defer to the collective for advise.