612001C-4 Manley Pistons EJ257 for 06-14 WRX / 04+ STi ZEX What's the difference between Journal

What's the difference between Journal Bearing and Ball Bearing

Note on Catalytic Converters:

Ability to change torque levels or demand levels sent to 4WD unit and TCM ECU for changing of up shift and down shift points

Oversized guide sizing are for the OD

Previous Gen1 PBO085-1000

612001C-4 Manley Pistons EJ257 for 06-14 WRX / 04+ STi ZEX What's the difference between JournalManley Pistons for the EJ257 motor in the 2006 2014 WRX and 2004+ STi models includes a full set of 4 pistons, wrist pins, ring sets and round wire locks. See more Manley Pistons for the EJ257 WRX & STi. Vehicle Fitment: Subaru EJ257 2006 2014 WRX 2004 2021 STi Piston Specs: Part Number: 612001C4 Pin: Standard . 180" Wall Bore Size: 99. 55mm (+. 05) Rod Length: 5. 137" Stroke: 79mm Standard Stroke (2. 5L) Comp Distance: 1. 209" Dome Volume: 22 cc