inputs.text: solid product - great product works advertised installed 8 hho systehems different vehicles straightforward easy install small amount average electrical mechanical ability one car 2 years 6 8 cyl vehicle willed need 2 follow directions especially making adjustments comes detailed instructions install make adjustments obtain wiring diagrams vehicle would suggest using obd ii scan tool verify stoichiometry altered o2 sensor signal modified leaning fuel makes easier adjust use scantool 423001 elmscan 5 compact comes software pretty cheap amazon