Obviously you took pictures but if it does become a issue as in they blame it on you, send them the pictures along with the clutch.
I personally wouldnt buy again from them, they already fucked up twice. Theres a million other companys out there that sell clutchs just get a diffrent one.
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Driving definitions: Understeer is when you hit the wall with the front of the car and Oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and Torque is how far you take the wall with you.