After researching a bunch of solutions, I decided to go with a combo of an x-brace and Vince front gusset cups. I had no interest in cutting into the floor to the degree the vincebar requires.
Starting with the x-brace. I went a unit from puretech. They ship pretty darn quick and have decent support via IG. The price is ok too, around 550 I think I paid. Similar to vincebar, neither have websites so just reach out to them on IG.
Install process is not too bad. Most difficult part is trimming the carpet panels to let the brackets pass through. You basically take a provided drill bit on the bottom side of the rear subframe mount hole and drill up through the floor panel. Do this with the carpet floor in place to pilot holes through it as well. Then use a hole saw on the top side where the pilot holes came out to cut holes in the racp for the xbrace.
Mine ended up not fitting perfectly.
Despite trying every which way to install, the holes from the brace to the tower brackets wouldn't line up perfect, so I did a little trimming. No big deal in the end.
As I mentioned, trimming the side carpet liners were difficult because it's hard to get a perfect starting point. I went at it with a dremel trimming out slits for each bracket.
Final product looks great, and so much less intrusive than other solutions
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On to the gusset cups...installing these is more involved than you might anticipate. The process involves drilling a pilot hole from the underside till it goes up through the floor, then using a hole saw where the pilot hole came out on the top. After creating the hole you will reveal the state of your front mount. Mine were free of cracks, again showing the great care this car has had.
Next you have to grind down the welds, and flatten the area out with a punch. After creating a flat surface, the mating surface has to be cleared of any paint and roughed up for epoxy.
I didn't document too much of this, but here is what it looks like all prepped before epoxy.
gusset cups also have to be prepped on the backside. Some time is also spent forming them to the floor with a hammer.
I used Ardalite 2014 w/ caulk gun adapter, and a rivet gun from harbor freight. All worked great.
Epoxy was applied and I quickly went to work on the rivets. Start from the middle out.
Don't mind the funny color. I painted them with an LSB spray can I had which turned out to not match even somewhat close, so I rubbed it off with some acetone.
Here is a completed shot. I wanted to finish it paint wise like factory, but that proved out of reach. I don't know about other colors but LSB racp panel is painted in a unique way that is impossible to match, at least at home. I tried all kinds of variations of base color with lsb on top and couldn't get it close.
Eventually, I'll take it to a body shop, but for now the leftover control arm paint looks pretty good.
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