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Per,
Your previous point was:
"My guess is that NO header will be an improvement over the stock 4-2-1 with a stock cylinder head."
My point in mentioning the ITB cars, which get 20 - 30 HP more than a stock engine,
and use a header is that they can get a significant improvement in power without changing the restrictions in the stock head - which are not within the area they are allowed to modify.
If a significan portion of this improvement is through a tuned header and a short, open exhaust, this supports the theory that you can improve the power from a stock engine head/engine through tuning the exhaust system.
John
V-performance.com
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