612000CA-1 Manley Piston EJ257 for 06-14 WRX / 04+ STi TIAL one is that they are

one is that they are often designed to blow open above a certain pressure to protect the engine and the other is they are not optimized for throttle response

-Retains stock active grille shutters

However adapter fittings are also included to reuse the OEM fuel lines (if needed)

Genuine TiAL Sport replacement 44mm MVR wastegate valve seat

Replaceable inlet filter extends service life

612000CA-1 Manley Piston EJ257 for 06-14 WRX / 04+ STi TIAL one is that they areThis Manley Piston for the EJ257 motor in the 2006 2014 WRX and 2004+ STi models is sold individually. Price includes one piston, one pin, one ring set and round wire locks. Please confirm if you need Grade A or B pistons. See more Manley Pistons for the EJ257 WRX & STi. Vehicle Fitment: Subaru EJ257 2006 2014 WRX 2004 2021 STi Piston Specs: Part Number: 612000CA1 Pin: Standard . 180" Wall Bore Size: 99. 5mm (Grade A) Rod Length: 5. 137" Stroke: 79mm