Looking for a Mine's ECU for a LS400

10 seconds for 1/4 Mile?! Cuz mine is BUTT slow. it might do 0-75 in 10 seconds. I gotta work on the tranny a bit its shifting so sluggishly. What else have you done to it? I’m wondering what kind of parts i might be able to get for it, (Trying to stay N/A)

1UZ-FE 4.0 V8, but its smooth not fast. No VVTi.