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Yes you are correct...I just did the unplug and stow away mod. Right away I didn't see much in lower volume at start up. I made sure the car was full cold...have not driven since yesterday and the flap was open when I unplugged it. Most of the noise and exhaust gasses come out of the pipe nearest to the inlet side and when it is hot, it still is mainly coming out of that side....I even verified the flap is full open. So I guess at idle and possibly lower rpm's the exhaust is not really that balanced like a true single center entry dual exit. It mainly relies on the passenger side entry/exit and that is why that exit pipe gets discolored and the other side stays clean...for the most part.
I will run it for a bit like this and see what the out come is...the MPE only has about 200mi on it so it still needs to open up
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