Someone just extrude honed their upper and lower intake on the 1999 LS400. It's the same intake on the LS430. The results were pretty surprising....and has me thinking of doing it to my LS.
The peak numbers are only "meh"...10HP and 27TQ. But it's the under the curve numbers that make me say "wow!". Up to 4300RPM, no less than a bump of 45TQ and at 4000 a whopping 60 TQ!
Not too shabby..and has me thinking seriously about this.