Matt,
I kind of agree with Kevin....well maybe. Depending on the depth dimension of the stock Porsche mount.
Its hard to explain with a picture. Ill try. The stresses developed in a retangular member due to bending are a factor of the depth of the member cubed, therefore, depth of member in the plane of the load is very important.
Best example I can think of is a try to break a plastic ruler bending it on the flat, then on edge, obviously much easier on the flat. I know there is some other factors in this. So I calculated the Section Modulus of A ---> Matt Mount 1\" x 1\" x 1/8\" thk vs. B----> Stock POrchse Mount 3\"
(?) deep x 3/16\" thk with 1/2\" \"lips\" on top and bottom.
A -----> 1867mm^3
B -----> 8044mm^3
Therefore, if the porchse mount is 3\" deep (?) stresses in the 1\" x 1\" tubing would be 4.44 times more than the stock mount, which would be bad.... if the stock mount is only 1.5\" or whatever....propbably not an issue.....make sense?
Cheers
Mike