Originally Posted by 2ss-booya
I'm in the same boat (zl1 m6). looking for a way to make 1st a little more useful with 700hp to the wheels and make 6th a little better on mileage for long distance cruising.
The best option would be to re-gear the transmission. Check with RPM Transmissions or Tick Performance to see if they have that option. They both specialize in building hi-perf manual transmissions. At 700 rwhp I hope you're not running regular street tires; but running a taller rear tire could help as well. You would be need to recalibrate the speedo which is not that hard with tuning software.