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i did the 103 upgrade 10.5-1 comp pistons, 260 cam, throttle body, screaming eagle htcc heads, already had the sert and big radius 2/2 pipes. i had 75hp and 90tq before and now i have 101hp and 100.8 torque, it makes a world of difference when i ride in the pocono mts i can climb hills like i am on flat land. spent about 4k but it was worth every penny.