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Was always told that a mild 1776 is the biggest motor you would want stock 1 3/8 exhaust.
Even then, they will stack up heat into the heads.
There was the HotVWs book "All About VW Performance Engines II" where they had an article featuring a motor that was progressively built, then dyno'd as it went with each change.
THe stock heater boxes with "extractor" were strangling a mild 1776 with Kadrons and stock valves/unported heads.
Putting on a 1 1/2 header added like 15hp to even this mild motor.
Now, don't get me wrong, they are a great cheap (free!) way to make heat,
But even a very mild motor will make more power with a proper exhaust.
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