Older 20v engines (B5254FS)had variable intake,different style intake manifold and gasket. When i say variable intake....they had some kind of flaps into intake openings. Those are engines '92-'95(including '95). All newer 20v engines have only "S" and no variable intake. https://www.matth...

Mine is prewired for D-pillar speakers and speaker wiring are connected with cd-player....tried it and speakers work but i have a problem to find original speakers with their original mountings to fit them.

Speakers from '99 will work fine in your 850.