This was first discussed in
this thread @ post#22
At the time I considered welding the only way; & still do if repairing one that has been ripped out.
I've since given this subject a lot of thought, as I plan to upgrade ARBs on my car this year.
For those of us with our mounts still intact & looking to strengthen the mount as a preemptive measure, here is what I found out.
First
I have a welder & can do my own work, so that wasn't holding me back.
My main issue was doing welding on a perfectly good mount.
I didn't want to deal with corrosion (long term) due to welding.
That lead me to
Epoxy!
I started digging around and discovered that the E46 M3 guys started using epoxy for doing rear sub-frame reinforcement about 3 years ago.
Lots of reading for you here.
**Please note the epoxy used in the first post is not the right type for our use.
This comes up later in the thread.
After some digging; 3M makes a structural epoxy that will work for us.
3M™ Scotch-Weld™ Epoxy Adhesive DP420
Spec sheet
This makes it a simple DIY project for those so inclined.
All you need is a steel plate sized & 2 holes drilled to go over the studs.
DP420 is readily available on ebay or online hardware sources (google it)
It is an industrial spec product and not to be found @ Home depot et al.
I will be doing this myself and will gladly post a DIY but it will be spring time before I get to it.
I wanted to get this posted for those of you that may not want to wait that long.
Keep in mind... this method is intended for those that do not have any cracking or damage.