[rjd_F30]

Not gonna lie, those pictures are pretty convincing lol. Definitely a bottleneck physically. But I would imagine that the fact it's a relatively low output, small engine not generating that much exhaust gas volume would minimize any gains from eliminating that bottleneck. If we were talking about a 6.0L 500hp V8 with that bottleneck, yah, that's definitely robbing power. Regardless, impossible to know if it makes a difference without dyno data like you said. I would be very interested to find out.