Editing Openai/6902a8c8-76f4-8001-a86a-93fe7b5e36c6 (section)

=== Short verdict ===
* If your targets were low-end torque, drivability, and strong midrange: this design is well-matched and should meet or exceed those expectations (assuming proper tuning).
* If your targets were high-RPM peak horsepower: this runner length and plenum will likely push your peak down; you may not hit a high-RPM horsepower target without shortening runners or changing plenum/venturi sizing.

If you want, I can:
* Convert the geometry into an estimated tuned band (give a rough tuned RPM band) — I can do that with the usual quarter-wave approximations and state the assumptions; or
* Run a quick “what if” (shorten runners by X inches or change TB to Y mm) so you can see how the band and velocity numbers change.

Which would you prefer?