Originally Posted by jeff denton
No way.
Any header that claimed to be such would only be a "combination of compromise".
There might be a certain RPM that it would work well on either engine, but it wouldn't be the same RPM on both.
Chances are that it might be better at most RPMs than a stock manifold, though.
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My take on what Jeff said...
All headers are a compromise, even specifically designed race headers...
The headers available today, the Pacesetter type, with very unequal length primarys, are not even remotely a decent header, but people such as myself have installed them and the car will continue to function. I do happen to believe a header could be designed that would be much better that what's currently available and cover about 70% of thouse out there with mild motors, read as a better compromise. I believe the mild HP upgrades out number everyone except pure stock. So from a sales standpoint there is some potiential volume in this bracket. The people who have made major modifications or are in it to race, will have the need and resouces to fabricate a better header that is more specific to their needs.
I didn't think oabut rejetting... while it may not be a necessity for the car to be driven, rejetting would bring out little extra power the header provides... not a bad thing in my book. This is similar to porting the intake in that reguard...
Great discussion.... for the record, I can't wait to see/hear a few turbo Opels running around!!!