its right after the two pipes meet into 1 just unhook the spring this helps to open it up and takes 5 minutes it will always be in the open position without the spring. i also took the baffles out and did a kn mod with the cobra FI2000r and the resister mod and the bike is running really strong. i've had it dyno'd at 114.5hp and 112.9torque. it seems to keep getting stronger. still working on scanning the dyno chart. if you do a search there is a sound clip of it.