BT Tech 04-09 Prius Chassis Stiffening Plate **NEW PRICE $55 Shipped** For sale Brand New Never used. $55 shipped Info I found on the item. Tired of being rocked around by the wind or larger passing vehicles? Then the BT Tech Chassis Stiffening Plate is exactly what you're looking for! Designed to stiffen the chassis of the Prius and provide better handing, this plate is fully CNC designed and milled using 6061-T6 and has a black anodized finish. Installation: The install is a snap and you can always go back to the factory one if you ever wanted to, but I don't think you would!! It basically involves removing 4 bolts, sliding the factory bracket out and installing our version with slightly longer stainless steel bolts and washers . Tighten them down to 17 ft/Lbs of tq and you are all done!! Most users will take less than 5 minutes to install the plate.