the flywheel is alot lighter even have holes to make it even lighter. Its an amazing clutch im really sorry i can use it because im going with a different transmission. I was even thinking of getting another FD and build it up with a 2 rotor so i can use it. But here are some pics of it. 13b engines dont have much torque so i will not help you much at the start but after you are in top end it might. Remember weight is the enemy of HP. The clutch is balanced perfect because is light weight enough to make power and heavy enough to also add the torque. The proof is in the numbers my car made 831hp and 710 torque we also made another car similar to mine with a different clutch and the hp was almost the same but 100 less torque. Amazing clutch.