Your only option from the list is JWT Genie. You could always go to a muffler shop and just get some cheap mufflers that... muffle. It'd cost considerably less in the long run and you could expect 5 to 10 years life out of them. At that point, you could try something new, or maybe someone(!) will come out with an exhaust system that uses mufflers for their purpose (ie, sound absorbtion).