Having installed one of these, here is my take....
First of all, the top-forward hole does not need to be drilled... that is an existing hole. And yea, it goes into the engine bay.
As for the single bolted bracket, it really doesn't need two. It is plenty strong at the door hinge with the single bolt. I don't know if that was for holding the door on or what (likely), but if your doors have never been removed from your car, you could remove all 4 bolts holding it on, and it'd still stay there unless you hit ot or stressed it a lot. the hinges are glued down, MUCH like the hood hinges are... SO, contrary to his instructions, do not open your door and put a jack under it. You risk stressing the door vertically, and cracking that seal. Just leave the door shut and latched.
Now, back to the front hole. I really think there should be two there, because that is a rotational point, whereas the door hinges are supported very well, the chassis could still possibly rotate around that hole. Also, it is highly leveraged to the mounting point. I.E. where the outside of the frame is, is not where the mount point is... it is on the inner frame, about 2.75" or so away from the plate on the brace.... so, if the chassis flexes, that has enough leverage to flex slightly.
One more thing: The hole the bolt goes through on the outside of the frame rail is like 1" in diamter, and there is nothing locating the bolt or the brace to the outer side of the frame, other than friction on the frame itself So, when the leverage allows it to move, it could easily cause scraping wear to the section of the body since it would move independantly of the frame slightly... this could open up bare metal, and the chance of rust to form over time on both the chassis and the brace.
And by the way, i'm not saying all of this to bash the braces or anything.... Robert is a good guy, and i've communicated all of this with him in the past 8)
First of all, the top-forward hole does not need to be drilled... that is an existing hole. And yea, it goes into the engine bay.
As for the single bolted bracket, it really doesn't need two. It is plenty strong at the door hinge with the single bolt. I don't know if that was for holding the door on or what (likely), but if your doors have never been removed from your car, you could remove all 4 bolts holding it on, and it'd still stay there unless you hit ot or stressed it a lot. the hinges are glued down, MUCH like the hood hinges are... SO, contrary to his instructions, do not open your door and put a jack under it. You risk stressing the door vertically, and cracking that seal. Just leave the door shut and latched.
Now, back to the front hole. I really think there should be two there, because that is a rotational point, whereas the door hinges are supported very well, the chassis could still possibly rotate around that hole. Also, it is highly leveraged to the mounting point. I.E. where the outside of the frame is, is not where the mount point is... it is on the inner frame, about 2.75" or so away from the plate on the brace.... so, if the chassis flexes, that has enough leverage to flex slightly.
One more thing: The hole the bolt goes through on the outside of the frame rail is like 1" in diamter, and there is nothing locating the bolt or the brace to the outer side of the frame, other than friction on the frame itself So, when the leverage allows it to move, it could easily cause scraping wear to the section of the body since it would move independantly of the frame slightly... this could open up bare metal, and the chance of rust to form over time on both the chassis and the brace.
And by the way, i'm not saying all of this to bash the braces or anything.... Robert is a good guy, and i've communicated all of this with him in the past 8)
