of course this is ok providing it doesnt have a jp4 head on a j4 bottom end, but it will be stampped on the head. Also for once someone has fitted stef approved pistons unlike the chocolate crap that is normally sold. 
Edit: bkr6ez are standard j4 plugs! :/

Edit: bkr6ez are standard j4 plugs! :/
90' 205 gti6 supercharged
05' Evo 9 IX GT
Team eaton.
Axle rebuilds please contact me for your needs.
https://www.facebook.com/axlesbystef/
05' Evo 9 IX GT
Team eaton.
Axle rebuilds please contact me for your needs.
https://www.facebook.com/axlesbystef/