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  1. info on coil over plugs..TCI or CDI?

    Hey guys! I'm new to the forums. I'll be glad to accept any info you guys can give me on these coil-overs. Any of the Q's will be appreciated, preferably all :p It's a 2000 Jetta 1.8t. Q1) The coils have "STI" on top, and the harness plugs are rounded on one end and squared off on the other...