I can not say enough about them. They are hands down the best injector, control wise, I have ever had. Better than FIC 750s 1050s, pte 1200, bosch 1600s, pte1600s and a few more. They make the care seem stock as far as fuel delivery. Matched with my 450 walbro I have not been able to out flow them on my 6266 and e85.