Most racing engines, including those in the Civic, use these caps because the original plastic caps crack due to vibration. It's definitely not just for show.

M32 x 3.5
 

• Applicable Vehicles

  FIT / VEZEL / N-ONE / S660 / CIVIC FK / INTEGRA / CIVIC / N-BOX / N-WGN / N-VAN / CIVIC FL / S2000 / CIVIC / CR-Z / NSX / TORNEO / ACCORD / FREED

• Applicable models

  DBA-GK3 / DBA-GK4 / DBA-RU1 / DBA-RU2 / DAA-RU3 / DAA-RU4 / DBA-JG1 / DBA-JG2 / DBA-JW5 6MT / DBA-JW5 CVT / DAA-GP6 / DBA-FK7 6MT / DBA-FK7 CVT / DBA-FC1 / DBA-FK8 / DC2 Si VTEC / 3BA-JW5 6MT / 3BA-JW5 CVT / 6BA-FK7 6MT / 6BA-FK7 CVT / 6BA-FK8 / EG9 FERIO / 6BA-JG3 first half / 6BA-JG4 first half / 6BA-JG3 RS 6MT first half / 6BA-JG3 RS CVT first half / DBA-JF3 / DBA-JF4 / 6BA-JF3 / 6BA-JF4 / 6BA-JH3 / 6BA-JH4 / HBD-JJ1 / HBD-JJ2 / 5BD-JJ1 / 5BD-JJ2 / 6BA-FL1 6MT EX / 6BA-FL1 CVT EX / 6BA-FL1 6MT LX / 6BA-FL1 CVT LX / 6BA-FL5 / 6BA-JG3 RS CVT Late (2022.08-) / 6BA-JG3 RS 6MT Late (2022.08-) / 6BA-JG4 Late (2022.08-) / 6BA-JG3 Late (2022.08-) / 5BA-FL1 6MT RS / 6BA-FL5 RBP / AP1-100 / AP1-110 / AP1-120 / AP1-130 / AP1-135 AP1-200 / AP2-100 / AP2-110 / EG6 / EK4 (early model) / EK4 (late model) / EK9 (early model) / EK9 (late model) / EP3 (early model) / EP3 (late model) / FD2 (early model) / FD2 (late model) / FN2 (early model) / FN2 (late model) / ZF1 / ZF2 / NA1 (early model) / NA1 (late model) / NA2 (early model) / NA2 (late model) / NA1 Type R / NA2 Type R / CL1 Euro R / CL7 Euro R (early model) / CL7 Euro R (late model) / DC2 Type R '96 Spec / DC2 Type R '98 Spec / DB8 Type R '96 Spec / DB8 Type R '98 Spec / DC5 (early model) / DC5 (late model) / GD1 / GD3 / GD3 1.5S MT / GE6 (early and late models) / GE8RS (early model) MT / GE8 (early model) / GE8RS (late model) MT / GE8 (late model) / GP1 / GP4RSHYBRID 6MT / GG7 / GG8 / GB3 / GB4 / DBA-GK5 6MT / DBA-GK5 / DAA-GP5 / DBA-GK6 / DBA-JH1

• Engine type

  L13B / L15B / LEB / S07A / L15C / K20C / B18C / B16A / S07B / F20C / F22C / B16B / K20A / MF6 / C30A / C32B / H22A / L13A / L15A / LDA / LEA