sup guys..you guys with invidia catbacks can hopefully help me with this question..which bolts you guys use to bolt the flange on the rear of the catt?
the skinnier bolt or the thicker one? and also do you take the black donut gasket off on the rear of the catt pipe? what did you guys torque them down to? and lastly did your catback come with invidia instructions manual or anytype of manuals?

thanks for reading ....