I was going to wait a few weeks but had some slack time this afternoon so decided to do it. I haven't driven it enough to say it's a definite improvement but so far so good. They're suppose to give a 2.5% increase in flow rate but if anything it seems to be running a little lean. Oh well, at 148k I figured the original injectors might need some attention & at $7.33 ea. for these, I had little to loose except a few hours time.