stock fuel cut is around 14 psi.(if memory serves me right). drilling out the stock afm pushes f/c to about 16(i think). as far as the lexus afm, im really not too sure. might be diffrent between on mkIII versus another one. i wouldnt try to totaly get rid of the f/c though, it can help keep your engine in one piece(just the way i like them too be!!!). ya might just wanna do some searching here or elseware online.