The 8mm bolts are 24-30N.m / 17-22 ft-lb
The 6mm bolts are 10-14N.m / 7-10 ft-lb
tighten the bolts in 2-3 steps in the following number sequence:
with exhaust facing you numbers are from left to right inlet side
12 8 4 2 6 10
with exhaust facing you numbers are from left to right exhaust side
11 7 1 3 5 9
Just start at no 1 and follow through.........................