How do you increase low end torque on a 99 Accord EX V6?

I can tell you what NOT to do. Do not install after market intake or exhaust. Those absolutely kill low end power.

^^^^don't listen to this guy

adding an aftermarket cold air intake and free-er flowing exhaust will help improve low end torque. Don't add a massive diameter exhaust pipe, but a smartly built mandrel bent pipe will improve you're overall power.