I have been loking for a site that you can have a picture of your style of bike and add parts like pipes, seats. I know about the harley customizer but looking for another for after market parts like thunder headers pipes for a dyna street bob. Thanks if you can help sorry if its a stupid ?

 

Have you looked through the Dyna section? You should be able to find a picture of a similar bike as yours, that has added the parts you are interested in. There is also the Dyna "picture" section.
Tom