Holley EFI system. It is a complete Holley kit. I'm not a fan of the 90 degree connectors that Holley used and they used a weird internal regulator that doesn't look to me like it will work properly. I think it is a fuel issue but I don't know for sure. Rev limit is set at 7000 rpm in the software. The data log shows a little ripple on the RPM signal after 6000 rpm which is what the trace looks like when it hits a rev limiter but we don't have one set at that RPM. We'll switch to a carb and MSD distributor just to see what happens. That is an easy test to run when it is on the dyno.