No offense, but it doesn't take a professional to turn off VSC, put the tranny in power mode, and power brake to get the best 1/4 in the GS400 (manual tranny is not an option and never has been on the GS). E-Shift actually slows the car from a dig, more useful for holding lower gear on a roll.

Motortrend managed a 14.3 (lowest published I believe)...

http://www.dragtimes.com/Lexus-GS400-Timeslip-112.html

Typical results vary between 13.9-15.0 for drivers I have spoken with. Switch the rear with a Turbo Supra 3.76 and add a higher stall dragon TC and consistant mid to low 13's are seen with SRT intake and aftermarket exhaust.

Believe me, the 1UZ-FE is quite a powerplant. The block is all aluminum with 6 bolt main bearing caps along with forged steel crank and balanced to zero forged pistons.