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I want to thank Darbs242. I was searching one night and came across his thread "Darby's F cleaned and lowered", very wierd and I and took it as a sign from the car gods because... Get this, my last name is Darby as well and I wanted an MM F. So now there are 2 Darbys with silver Fs. His is faster though. I don't believe in coincidences.
ahhha the good ole 4G63.........my buddy got one. (fully built)
For the real world. The F is enough for me with only compromising space. The Evo while great for the track isn't real world friendly .. To me. And too many compromises.
No, it's a known issue. Many of us had the same problem with our Fs. This same pump is used on a few Lexus products, they've all seen this issue. Aisin just didn't quite get it right in 2008. They have a new part number now, so once you get it changed, you're good for normal service life.