A stock Alternator and Radiator. How long do they last? What is the recommended to have the stock parts replaced?
Also for a stock muffler? When should it be replaced?
I wouldn’t think you would replace any of that unless it is broken. I had a hole in my radiator, so I replaced it at 150k. I still have the stock alternator at 160k.
You should replace your muffler when there is a hole in it. You will definitely know when you have a hole in your exhaust. If you have a muffler from Acura, it will last much longer than a cheap midas muffler. I had a muffler from Honda on my Civic, I put 50k on it, and it was still in good shape when I got rid of the car.