Toby and group, I talked to an applications engineer today at SPS Technologies, these are the same people who made the torsion bar for the doors. He is also a car buff and he understood what I was talking about on the TAB bolts. One of his comments to me was, if you up grade to the 12.9 bolts which has 15% more tensile strength, wouldn't it be better if something has to bend a little, it would be the bolt and not the frame or any of the parts around it. He said that what was making it bend has to be transferred to something. With some good plating and baking would make them almost bullet proof for life. Yes, they could bend a little under certain conditions, but wouldn't any part and if were going to push the car to these limits, then the whole suspension system should be reworked. I took a bolt out of one of cars that is a turbo and it had a slight bend and slight rust. It was unplated and was in a car with about 85,000 miles and a Turbo. I guess for about $5.00 to $8.00 dollars for the 12.9 bolt, plated . Why couldn't they be replaced every now and then if you didn't feel good about them. My 11004 with 55,000 miles still has the original bolts and I'm not the lightest on the gas peddle. John hervey http://www.specialtauto.com/