Hey everyone so i recently started noticing that when i shut off my car it makes this grinding noise. The car is a 323ci with 157000 miles on it and the entire coolant system as been replaced not that that really matters i suppose. Only performance mods done are light weight pulley and nose cone other then that there is nothing done to the engine. Worst case scenario my engine be bad? Let me know what you guys think. Thanks for any help in advance.