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Originally Posted by ichitaka05
Hm... if that's the case, then isn't that add more weight to the car? Also two separate cat equal to two extra o2 sensors (before cat & after cat)... which means more ecu crap. Also add to that, isn't it gonna cost more for after market parts?
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Yep it does have the potential to add more weight, although its entirely possible a true dual made of aluminum or titanium could still weigh less than the stock exhaust.
I honestly haven't done much research on any boxer engines running a true dual setup. If there is in fact a single o2 sensor stock, I imagine the only way to pull it off would be an X pipe in the middle of the system and to mount the sensor there. Maybe we'll get lucky and see two o2 sensors, but I'm not sure that would happen.