the whole scandal last year with Toyota (or was it Honda?) - they were
alleged to have used a manifold design that reduced the pressure seen by
the pop-off valve, which allowed them to run at a higher pressure.
Anyway, not to change the subject but IMO the only thing you can
regulate, and the only thing you need to regulate, in any engine
formula, is fuel usage. Regulate the amount of fuel they can use during
a race, and if somebody comes up with a magic way of getting more ft-lbs
of work out of that fixed amount of fuel, well then good for them.
Racing is about competition isn't it?