i ran a 15.3 at 2600 feet in Tucson AZ. but.......... i couldnt get my 60ft down! i too drive a 6spd. pull the 17 and 18 fuses and the cars awsome! you just have to be careful not to over rev before launching cus the car will bog down id say 1500 to 2500 is you best bet but i only got a chance to run the car twice because of how packed the track was. i think i could have broken 14s easy if i nailed the launch.