Awesome, awesome work you guys. I am to the exhaust stage in my EG33 Legacy Rally Car project. I'm a total exhaust noob. I need to whip up a tighter fitting exhaust than the stock Y pipe but am unsure of the material to use. I am going to reuse the stock cast headers to retain that durability. So what is a good material to use? I want to keep it cheapish so I can build 2 and have a spare.