David Z not only doesn't have the bigger TB, but also doesn't have the ported upper intake. He does however, has the larger lower intake manifold.
Even if David got both the TB, and larger upper intake, and got time to tune his car, I don't think that his horsepower level would raise above 300.
Maybe the heads on our cars are already pretty well designed? It seems that getting headwork which could exceed $3000 is not really worth 20 odd horsepower, but I must admit having a 100 hp/ltr engine would be badass!
James
