Once my LS1 C5 needed a little extra juice. However, I went with a
head and cam package and didn't need that juice anymore.
Then I needed more power and went with a Supercharged F1C powered by a 416cc LS3
in my 1999 C5.
Not installed in the vehicle anymore.
GM LS-1 EFI SYSTEM, Part # 20227,
NX Adjustable Kit, 50-75-100-150