The HKS unit I put on the car had a nice tone, not too loud. I like the looks of these stainless Steel units, however, it is not just the noise for my concern but, fitment. The SC does have some differences, and I am not 100% sure this replacement is a direct bolt on. I have not talked to the vendors, but many times they do not have a working knowledge of the products. (If the computer does not tell them). Since the car is 30 years old, most vendors, just don't know the car, much less the product.