MPPerformance.com: "MP Performance is proud to introduce the only 3 inch stainless steel exhaust for the 9-3 Viggen.
Our exhaust is made from 409 stainless steel from turbo to tip. It incorporates a high-flow catalytic converter, a straight-through perforated core muffler, and two flex pipes to produce a factory quality fit. It is a bolt on system; no cutting, drilling, or welding required. All installation hardware and gaskets are included.
This exhaust produces a mellow tone at idle, burbles a little on throttle blips, and sounds an aggressive, yet sophisticated note on full throttle in the higher rpms. Sound increase in highway cruising is barely perceptible, and around town the subtle growl will tell the trained ear that this is no ordinary Saab.
Combining a substantial diameter increase as well as a performance cat and muffler produces a big power gain. We have yet to dyno the system, but just adding our downpipe (included in the full exhaust) yielded an 18hp and 30lb-ft gain at the wheels. We will have dyno results for the full system soon."