mufler and bushings question

[mracer2001]

Hello all. I just purchased 75 911S and looking to do some work on the car. Meanwhile I came up with a few questions I hope to get some help on.
1. I am loking to replace the stock muffler with something more atlhletic in both sound and performance - any recomendations? I am not trying to spend a lot of money.
2. also the shocks and bushings are both in poor shape and must be changed. Is there a complete kit/ set of bushings that any vendor is selling?
3. The cars under body has been covered with spray and shocks are all covered by the same material- i can't see the color in order to order the right ones. Is there another way to learn which ones my car has?
Thanks for your help