Hey Dave, Happy New Year. I have installed a complete Pypes 2 1/2 inch stainless steel exhaust system on my car with the stainless Street Pro Mufflers. I have heard the Race Pro mufflers and they are VERY loud. If you are driving your car on the street, they are just a step below open headers. I would not recomend them for street driving. They also do instalations at their facility. If you are that close it may be another option for you. They maybe able to let you try both types of mufflers. I am very happy with the sound quality of the Street Pro mufflers and get a lot of compliments on them. They flow very well, sound great and the police don't bother me.