Oh snap!! Literally... engine subframe stud advice needed...
 

Well, my worst fear has become a reality and am looking for advice on what my best route should be. I have an idea already in my head but I was hoping somebody would have a better idea. I obtained a set of Mazsport solid mounts (almost identical to the raceroots mounts) and installed them and LOVED them from day one. Things got a little shaky the other day and I had thought I had lost a seal (rough idle and rough reving down below) but upon further inspection I checked the driver side mount and realized the the stud that is welded to the subframe for the original mount in which the stock mount is bolted to had broken off which explains the rough idle and shakey takeoffs. Any suggestions on what I should do, I am going back to the stock mount setup with upgraded inserts but I will need to do something about this situation in order for it to all work. Should I just obtain a new subframe or should I go about welding a new one on? thoughts? suggestions? flame? send it my way.

Replacing the stud is the easy part :) Getting at it is the the trick

A competent mechanic should be able to fix it without replacing the subframe

isnt it a welded stud? or am I incorrect about this?

Yes...welded...but there are always options....:)

I have had to deal with that several times in the past. Particularly with unibody cars.

One good remedy Ive used in the past requires cutting tools and a welder.

If it is the setup I am thinking, the "head" of the stud (if the mount is secured by a nut) or the welded nut (if the mount is secured by a bolt) is buried inside the sub-frame and is not accessible after initial assembly of the sub-frame.

Use an angle grinder to cut a squared-off "U" in the sub-frame adjacent to the broken stud. With a torch, heat up the remaining uncut line till its red. Use a pry bar to fold back the flap to a 45* angle of the sub-frame. Dont go beyond 45* because the metal can begin to split and lose its strength.

Once you have access cut/chisel/remove the broken piece. Install a new one and welt it in place. Be sure to do a test fit with the mount before you close up the hole.

When all is set, use the torch again to heat up the uncut section of the flap and use a hammer to close it up. Use the welder to close up the "U" and you are all set. Wire brush the area and apply a good quality rust prevention paint.