EFIE known as Electronic Fuel Injection Enhancers are used to help regulate or adjust the voltage on an oxygen sensor. Most of these dual EFIE circuits or EFIE circuits are to be purchased for water4gas plans or other comparable HHO plans. This module or circuit is usually added between the oxygen sensor and ECU or electronic control unit. This circuit is often added on some vehicles because when an HHO kit is installed the exhaust is so clean that the voltage produced by the O2 sensor can cause the computer to compensate by adding more gasoline to the mix thus reducing gas mileage. An HHO EFIE circuit adjuster is used to aid in this situation. Buy a EFIE Kit to ensure you hydrogen HHO generator system is working at peak efficiency.

HHO Digital EFIE
HHO Digital EFIE $20.00
Time Remaining: 1d 2h 21m
Buy It Now for only: $30.00

Unique EFIE for Narroband (O2) Sensors HHO Edition Advanced No Like It On Market
Unique EFIE for Narroband (O2) Sensors HHO Edition Advanced No Like It On Market $49.95
Time Remaining: 4h

Dual Edge MAP MAF Sensor Enhancer HHO Water4Gas EFIE
Dual Edge MAP MAF Sensor Enhancer HHO Water4Gas EFIE $29.99
Time Remaining: 1d 13h
Buy It Now for only: $29.99

EFIE Dual Oxygen Sensor Fuel Saver, hho dry cell kit
EFIE   Dual Oxygen Sensor Fuel Saver, hho dry cell kit $59.00
Time Remaining: 11d 7h 15m
Buy It Now for only: $59.00

Digital Controller with CCPWM for HHO Kit . PWM , EFIE , IAT , MAP / MAF
Digital Controller with CCPWM for HHO Kit . PWM , EFIE , IAT , MAP / MAF $285.00
Time Remaining: 11d 5h 47m
Buy It Now for only: $285.00

Digital Controller with CCPWM for HHO Kit. PWM, EFIE, IAT, MAP / MAF
Digital Controller with CCPWM for HHO Kit. PWM, EFIE, IAT, MAP / MAF $275.00
Time Remaining: 11d 4h 37m
Buy It Now for only: $275.00

HHO Digital EFIE version 041
HHO Digital EFIE version 041 $59.99
Time Remaining: 23d 14h 27m
Buy It Now for only: $59.99

" TWO "-HHO-HYDROGEN-DRY-CELL-GENERATORS-MODEL 4.5 DIY KIT-EFIE-CC PWM Available
$99.95
Time Remaining: 2d 10h 57m
Buy It Now for only: $99.95

" 2 "-HHO-HYDROGEN-DRY-CELL-GENERATORS-MODEL 4.5 DIY KIT-EFIE-CC PWM Available
$99.95
Time Remaining: 2d 7h 57m
Buy It Now for only: $99.95

DUAL-HHO-HYDROGEN-DRY-CELL-GENERATORS-MODEL 4.5 DIY KIT-EFIE-CC PWM Available
DUAL-HHO-HYDROGEN-DRY-CELL-GENERATORS-MODEL 4.5 DIY KIT-EFIE-CC PWM Available $99.95
Time Remaining: 2d 5h 57m
Buy It Now for only: $99.95

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