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@Jung
The headers look ok - 1 7/8th inch. Collector looks like 3 all the way back but there are 2 pinch points down to 2 1/2 or so and 2 big collectors per bank.
Not like the car is quiet or anything but considering it is a pretty mellow thump rather than a evil cackle....
Cam's fine and power and torque curves are both very healthy up to 4k - just looks plugged after that.