| this from SZ: "We've gained almost 100 lb\ft of torque by adding these along with the Ash Massives\2.5" piping on a GT28RS equipped Z32." https://specialtyz.com/shop/300zx/z1-throttle-bodies.html You might want to call Greg or Seb and discuss how increasing TB diameter would benefit your particular setup. However,  maximizing the gain achieved by increasing TB diameter has to be seen as one part of a "flowing more air" strategy that starts at the air filter and ends at the exhaust tip-->dual intake, larger dia. suction pipes, ICs, LD charge pipes; improved manis, larger DPs and LD exhaust pipes. 
   Chance favors the informed
  |