A common problem for Lexus owners (among others) associated with extreme lowering is upper control arm (UCA) clearance. Once you go low enough the UCA will contact the shock tower inside the wheel well. Here is my solution:
Use common sense and proper safety precautions if you attempt this! This is a structural part of your car! We accept no responsibility for damage to you or your car.
1) Locate where the UCA is making contact inside your wheel well. If you do not have a mark then you aren’t low enough. Work on that then come back.
2) Measure twice… three, four times… cut once. I can tell you from personal experience that redoing this is infinitely harder than doing it right the first time. You want your pilot hole to be close (if not exactly on) your contact mark.
Once you have gotten your pilot hole placed correctly you can make your cutout with a hole saw. I chose a 3″ to match the OD of the pipe I was using to trim the hole. 2.5″ is the most common size from what I’ve observed.
You can see that I drilled more than one pilot hole in order to get it where I wanted before I cut. As long as the trial holes are in the radius of the hole saw: no harm no foul.
3) You can stop at step 2 but I chose to take it a little further. I wanted to dress up the hole as well as restore some structural integrity (part 2). Some people choose to leave it be or box it so that the hole is covered but I wanted the UCA to be visible in the engine bay.
First the paint around the hole was stripped with a wire brush. The 3″ OD x .25″ ring was then tacked and welded in.
4) Some grinding and temporary paint and it is ready to be body worked and repainted.
5) Repeat for the other side and you’re done.
-BLKonBLK98
libertyvip.wordpress.com 
Great way to recuperate any structural strength that might be lost by cutting a hole. Good work.
That’s great work Mike… I think I’m going to get this done soon…
nice job Mike, do mine now :D.
Love the work! nice job
How much more clearance do you get when you drill out that hole. Looks like the Balljoint isn’t sticking out that much out.
mine isn’t poking through at all in the pic. i did this in preperation. i’m on coilovers so there was only contact under compression but when i go lower it would have been constant. i’d say the usable gain (height where it bottomed out before vs. height it will bottom out now) is 1-2″ but hardparking (i.e. laid out still on air) could be as much as 3-4″.
Nice work man!
Looks tight. Like the patch up work afterwards. That car however has a lot of free space around that area to play with.
I’m workin on it… gimme a minute.
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Did you drill the hole right on top of the marks that the UCA made or a little to the side for clearence of the actual arm?