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Spool Performance FX-200 High-pressure fuel pump upgrade
All spark plug boots are high temp gray
and overall balance
N55 engine)
Smooth internal surface for improved airflow efficiency
SPOOL B58/S58 Plug and Play Ethanol Sensor Harness Stroker Kit Spool Performance FX-200 High-pressure fuelSpool Performance B58 S58 Plug and Play Ethanol Sensor Harness Connect our ethanol sensor harness to your ethanol sensor and your fuel controller. Our harness makes everything seemingly plug and play, no splicing or cutting of any wires. One side connects straight on the GM ethanol sensor and the other side connects onto your secondary controller harness.
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