This report presents the results of a laboratory correlation study between EPA and Honda Motor Company, Inc. It specifically compares Honda's certification test site at its Suzuki laboratory to EPA's certification test site No. 6. In general, the test sites compared in this study showed a high degree of equivalency. No significant differences were discovered in dynamometer or CVS characteristics, and vehicle emission test results correlated rather well. The only significant discrepancy was laboratory measurement of CO emissions, which could have been the result of laboratory barometric pressure differences. Vehicle variability made an accurate assessment of this effect very difficult.