yeah...losing weight on your front tires (since celica is fwd) will reduce some traction, technically.
however, your car already weighs 2,500lbs...it's got plenty enough weight to keep its wheels on the ground...realistically lightening your celica as much as possible will only improve your times (lighter = less to push = faster acceleration even though technically reduced traction)
if you want better traction, get sticky tires ('soft' tires).
if you want downforce (virtually 'weight' when air passes over it) get front bumper canards or Hood
spoilers. rear spoilers help very little and for a celica they basically serve a style function although they do help when cornering at high speeds (if you autox or streetrace etc) by helping improve rear wheel traction)
but if you drag (or race straight line) then rear spoilers only hurt you.