[Coloradocobra]

Thanks, Perry

The butterflies open all the way and we checked secondary opening on the dyno. I checked the butterflies early because that is just what it feels like. I know someone with a DP so I may try it out. At higher altitudes, most engines don't like all the air a DP can provide so vacuum secondaries are typically used. Generally, we lose about 15% at 5,000 feet - but this is across the RPM range, not just in the upper end.

Keep 'em coming!

Gary