Our throttle body machined bore diameters are as follows:
B16A & B17A: 64mm inlet(before throttle plate) and 64mm outlet(after throttle plate).
B18A/B (LS, RS Non-VTEC): 64mm inlet and 64mm outlet.
B18C1 (GSR): 66mm inlet and 66mm outlet.
B18C5 (Integra Type-R): 70mm taper to 68mm inlet and 68mm outlet.
K20A (RSX Type-S/DC5-R): 70mm taper to 64mm inlet and 64mm outlet.
We now offer boring service for K20 throttle bodies
All Acura/Honda Throttle Bodies - $200.00 (w/ core exchange)
See the difference between a factory K20 TB and our overbore K20 TB!