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

=== What this geometry will give you (practical, non-mathematical) ===
* Strong low-end and midrange torque / very responsive low RPM: Long runners (22.7") with a relatively small runner diameter (41 mm) strongly favor torque and cylinder filling at low–mid RPM. That’s the classic recipe for street torque and good drivability.
* Good idle stability expected: The combination of long, relatively narrow runners and a modest plenum (3.15 L total / ~0.79 L per cylinder) promotes good air velocity at idle which helps atomization and stable idle—provided the throttle body / idle control is set up properly.
* Throttle body sizing: The 56 mm TB has less cross-section than the sum of the runners (normal). That makes the TB the higher-velocity throat. For everyday street use and a torque-focused tune this TB is fine. At very high RPM it could be a limiting restriction vs. a larger TB, but for a 22R used on the street it isn’t unusually small.
* Plenum volume effects: ~3.15 L total is a relatively small plenum (helps responsiveness and midrange). It supports your torque-oriented goal; you won’t get the “large-plenum high-RPM” behaviour that favors peak HP above where the runners tune.
* Headers & cat delete: Long-tube headers and removing the cat reduce backpressure and will help top-end and midrange power. Combined with your long runners they’ll likely broaden the torque band and maybe raise VE across the midrange — a good match for your intent.