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Old 11-22-2006, 01:08 PM   #1
Scooby Newbie
Member#: 35566
Join Date: Apr 2003
Location: Miami Fl.
2002 STI WRX GT30R
WRC Blue

Default Built motor STI EJ25 with EJ20 Heads plugs Qs..

What plug do you need for this engine combinations.... I am a little confuse...
Normal WRX plug or STI standard size plug.....

STI EJ25 with normal WRX EJ20 heads....
STI EJ25 with Type C heads
STI EJ25 with JDM big ports head non AVC..

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Old 11-22-2006, 04:44 PM   #2
Scooby Specialist
Member#: 44629
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: '04WRX-Axis ej257, IPT 4eat.
CNC 'd heads, cams
DB18g/EWG - F/S $8K


WRX head uses the WRX plug. The STi and WRX heads differ when it comes to spark plug thread depth. Basically you use what ever plug the head normally uses.
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