How To Cure a "Rappy" Exaust?

I don't think a glass pak would be a great idea. Resonators ethier in line with the pipe or like this page at Sumitt; http://store.summitracing.com/egnsearch.asp?N=700+4294923429+115+4294922678&NeXID=5

Pace Setter tip; http://store.summitracing.com/partd...&N=700+4294923429+4294922678+115&autoview=sku
Headman tip; http://store.summitracing.com/partd...&N=700+4294923429+4294922678+115&autoview=sku
Flow tecs; http://store.summitracing.com/partd...&N=700+4294923429+4294922678+115&autoview=sku
Headmans pictured below.