I used the linear torque, hard pack map from gytr for stock exhaust. Felt great, bottom was super smooth but still powerful. Seems as if it had more midrange and top end as the rpm's climbed. I'm a throttle roll on type guy and felt this is a good map to start with... felt the loamy, hard hitter just dug holes instead of moving forward. So to those that know, does retarding the ignition and adding fuel pick up more top end or am I feeling something else? I ride sand, so momentum is a friend, and too much snap just gets you spinning versus going fast...but I never hear people using the linear map?