Mine were fine , welds were all cleaned up nicely straight out of the box , everything fitted exactly , old pipes off , new pipes on under 2 hours
Then it took ages to change the ECU and filters
Check the code on the box for the size , maybe they have sent you 54mm ones instead of 57mm , there are 3 sizes made , 50 , 54 and 57.
Allegedly the 57's rub on the swingarm (mine do) slightly