I believe the torque setting Is 8nm , the bolts are alan heads I didnt have a alan socket to fit them just an alen key so I couldn't torque them down , But I think I tightened them way past 8nm .
Fair enough. Way past is not a good judge as way past can warp mating surfaces. I'm not trying to inject a worry; probably not a concern. I would want to check as engine heat rises and falls over time to assure seal as you don't have access to a torque wrench.
I like the look!
BTW: The pipes are badass! What/who are they or are they a custom made unit? Really want to know.