Leaf,

I've used all three, of the two aftermarket, Bosal would be my choice. As I recall Bosal made(or still makes)some Volvo OE exhaust components. I replaced my son's 245Ti cat back about six years ago. The axle, tail pipe and muffler were Bosal, the supplier only had Starla for the intermediate pipe. After two years the Starla pipe had rusted through, the Bosal pieces were good for another 3 years. The Bosal pipes seemed heavier and looked better made than the Starla. I replaced the entire system recently and went all Bosal. Just my $.02