OK, beffore you do a gear change, take this into consideration.
When changing gears, your engine will rev alot faster theirfore, giving you more low end torque. HOWEVER, even thought you will gain low end torque, you will loose some high end torque and you will reduce your engine's life, I really asked around the pros a lot on gear ratio changes bcs I changed mine on my mustang + since I changed my ratio, I had to get my speedometer re-adjusted