TB Size
Honda/Acura Throttle Body Inside Diameters (in mm)
| B18C1 | 60 |
| B18C5 | 62 |
| B18A | 58 |
| B18B | 60 |
| B16A SiR | 58 |
| B16A SiR2 / B16A2/ B16A3 /B16B | 60 |
| B17A1 | 60 |
| B20B/Z | 60 |
| F20C | 62 |
| D15B7 | 56 |
| D16A6 | 55 |
| D16Y7 | 56 |
| D16Y8 | 56 |
| D16Z6 | 56 |
| D16A1 | 55 |
| D16A8 | 55 |
| ZC | 55 |
| D15Z1 (different bolt pattern) | 40 |
| H22A / H23A | 60 |
| F22/ F23 | 60 |
Note: Most Honda Throttle Bodies are tapered and the outside diameter is larger than the inside diameter.
ITR/S2K/RSX-S are 62mm