How about a simple and inexpensive mid chassis "transmission tunnel" stiffening brace? I read nearly all of the posts on Priuschat and many of the posts on other sites regarding the "mid chasis" stiffening plate for other Prius versions. While nearly all of them are an improvement over the thin and nearly flat "hour glass" shaped sheet metal strap held by four bolts to the bottom of the rails of the transmission tunnel, none of thems seems to be structually design for maximum stiffness and rigidity. That can only be had with a "box beam." My design will be simple and elegant. It will hang down only a lttle over 1.5 inches below the bottom rails of the transmission tunnel. I'll be using a special 6105-T5 aluminum extrusion with rounded corners, which is nearly twice as strong as the run of the mill architechual 6063 with the square corners. Since the mounting holes for the brace are only 78mm apart, I see no need to make the brace as a plate three to four times as wide, as others have done. CNC milling the stiffener out of solid aluminum and anodizing it to a pretty color, while nice to brag about, in may opinion, adds no benefit to the function of the stiffener. The longitudinal axis os the tube is exceptionally strong and stiff as it is and will keep the bottom legs of the transmission tunnel from flexing much better than the OEM separator. I also considered making the tube "torsionally stiff," but it does not appear to be necessary, since the transmission tunnel, itself is a tube and stiff enough, already. Basically, for a mere $40-$50, I believe that I can achieve the same, if not better stiffening as the $120-$200 custom made plate. My box beam stiffener will mount with the original screws. It can be easily adapted to all Prius types by drilling the mounting holes in their appropriate locations. I will keep the folks, here, informed and will post photos of the simple elegant solution as it becomes available.