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SU Needle set screws? Also: SM needles? 120-130

I've been tinkering with my SU's and pulled them apart this afternoon. In the process I seem to have misplaced one of the needle fixing screws. An M5x1.00 feels like it fits but I'm hesitant to try and snug it up without confirmation it's the correct size and pitch.

Also, the needles are "SM" variety. Should I swap to the KD or DX profile that seems to be much more common? The SM's look like they run much leaner on the top half of the power band. Car is a B18 automatic, all stock internally as far as I know.

SM: red line
KD: green line
DX: yellow line






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