Originally posted by NZinAUS
The EF air box has been proven to flow better than the EA. Auto speed did a flow test on various air boxes and the EF outflowed all other ford made boxes - including the AU apparently. Scott hart also used an EF box running backwards in his EB race car and on the engine dyno it showed a 3kw gain over the stock air box
Sure, but I did say 'a more or less breathless engine'.
Being a race car, I assume it's not standard, so not really breathless right?
The only real restriction I can see with the EA/EB/ED typ is the rubber which connects the air box to the TB. Some have no restriction, and later models appear to have a much smaller section just out from the air box whcih appears to be a venturi. EA's don't seem to have this restriction.
On a standardish engine I really don't see a point, unless you change the manifold
Out of interest, how many kw does Scotts race have?