The power plant of each model can be quickly identified in the engine bay, with the oil cap on the right of the engine cover for the 2.0 DOHC V6 and on the left for the 1.8 SOHC and 2.0 DOHC MIVEC V6. On MIVEC-engined models the front brake calipers are larger, with twin-piston operation, compared to the single-piston units of the other models. The rear single-piston calipers are common across the range. (Some owners may have updated the rear units with those of the larger piston, used on the Evo I/II/III and/or the front units with the larger calipers as used on the GTO + another popular brake mod is using EVO4 front caliper brackets on a GPX with the standard caliper coupled with 294mm EVO4 Discs)