The exhaust components article I referenced is actually a summary of three different and separate exhaust component tests we have conducted. Each was fully authenticated and documented, and was initially published in High Performance Pontiac magazine. And on each we had exclusive use of the track so had strictly controlled test conditions and traction! And when trying to test or measure differences of one tenth of a second or less, the tests have to be made under the same weather and traction conditions. Otherwise, weather differences from one day to the next can cause a variance in times greater then the parts under test.
In theory, changing from a horrible exhaust system to an excellent one might change metering requirements. However, the minor changes gained would probably not be statistical significant for a test report. And when comparing performance mufflers or pipes, there is very little difference between them. So changing metering would just add another variable to the test.
It is possible that an X crossover might respond to slightly different metering, but the fact is that even with the metering optimized for the H crossover, which we had raced for several years, the X crossover was significantly quicker and faster. Jim Hand
[ January 28, 2002: Message edited by: Jim Hand ]</p>
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