Thanks for the information guys. I think that my fear right now is losing the power up top but if in a 1/4 mile sprint the final drive will increase acceleration significantly, then I think I may be interested. If I will lose up top , what other mod could I add to compensate for that loss..????? and...... would the cold air intake, that i currently have installed, which gives the car better top end speed do the job?? On a another note...............what other mods are available for the 2ZZ and still keeping it asperated???????