seems to me that there is no good reason why as far as dyno tuning goes
:+1::+2:If you are using exhaust gas analysis, or even just a wide-band to measure air/fuel ratio, then the secondary air injection system needs to be blocked so that the exhaust gas measurement does not give a false lean reading. But, you don't need block-off plates to do that ... just plug the hose leading to the air suction valve.
Not correct, the vapors are not coming from under the valve cover, those go directly to small port holes that are actually connect directly to the exhaust ports.yes that i understand but if u look at the 08 system, there is no air being injected into the exhaust. vapors r pulled from the valve cover into the airbox only