Question about nitto torque dampner install

[YarisSedan]

After installing mine i noticed a slight sound comming from engine which i think its either the dampner valving noise or the vibration of it hammering against the strut tower. Which i assume is normal. I am hoping someone here to has installed one will tell me its normal or that what i have is not normal.

Also how the adjustment works on it. Seems like you loosen the nut on the front and then you can rotate it to make the longer or shorter. So i would want it shorter for less travel for a more stiff shock absorption vs longer for more of a cusion?

[cali yaris]

It's the tension on it that is the adjustment, in or out. If you're feeling some vibration that is normal. Make sure all the bracket connecting bolts are secure.