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I'm starting to think that the issue might be related to some different ECU behavior on the Asian market X6es. Skywagon's supersprint is a single muffler exhaust which is relatively comparable to the dual muffler Hartge. Henry's condition is similar to mine as well since I did the golf tee mod, which keeps the exhaust open and he only removed the valve and changed the tips. Since the tips are bolt-on, not welded, the pipe size is the same as well.. It's also very weird that the engine runs very lean (more air, less fuel) at the low end with just an exhaust change. The exhaust increases the amount of air the engine getting but it should be more obvious at the mid-high end, not the very beginning of the rev range..
I guess we'll see for sure when I get the magnaflow exhaust done sometime this week or next. If the issue is not related to some ECU behavior, I should feel the same low end loss that you guys had.
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