Akaprovic gets my vote.
Have ridden with friends with both of these pipes the Akaprovic with the insert in is way quiter than the Q4. The Q4 only uses one of the two bracket mounts making it very easily bent
I am planing on changing the oil in my forks and rear shock (04 KTM 450EXC). I am hoping to find out the stock oil weights for front and rear as well as the oil height for the shocks and the right pressure for the nitrogen catridge on the shcok