I work in a repair shop and have had a lot of vehicles with broken or rusted exhaust manifold bolts causing leaks and annoying ticking sounds the last few years. Got sick and tired of replacing the entire thing when I couldn't get them out, so I finally looked into it and found K.A.P. exhaust manifold bolt repair kits online. I have been using them in vehicles for a couple months now, and boy does it save me time, and also saves the customers tons of money in the end. They work great and are easy to install, I would highly recommend looking into them if you have similar problems.