Quote:
Originally Posted by bofa
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.
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some tuners use only 1 bank for Narrowband o2 for stock ECU. But most use a crossover pipe for 02 as well, but for the main reason of Exhaust scavenging, or quasi-static scavenging effect based on the Subarus firing order.