Quote:
Originally Posted by oil pan 4
With converging and diverging nozzles I believe 7 degrees is ideal.
There are companies that sell 7 degree reducers for intake and exhaust piping, they are kind of expensive.
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According to this:
http://www.spdexhaust.com/pdfs/02-11...Collectors.pdf
The best angle is a 12-15 degree convergent angle with a 3 degree divergent angle. Interesting that those are different.
