Hi I'm Harry from Sheffield. I've changed my brother's spark plugs and coils on his car this weekend. The coils were worn out and causing misfires. While I was under the car, I noticed that the exhaust fixings are extremely rusty. There isn't any signs of leaks, but I was thinking about changing them for new stainless steel nuts and bolts, so that they are easy to remove in future. Is it better to change them sooner rather than later? Or is it ok to wait until he needs a new exhaust? Bearing in mind that we have a lot of salt on the roads for the next few months.