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The slip joint on my B&B's have a little carbon tracing around the edges, but there's no exhaust leakage noise.
I had an exhaust tick tick when I got the car but it was a pulled exhaust port stud on the #1 head and it was leaking by the steel exhaust port gasket.
A tick tick description of an exhaust noise is usually the intermittant sound of one exhaust port leaking while all 6 cylinders are running, while a slip joint would get the pulses of all 6 cylinders and would be more of a steady exhaust leak noise at idle.
You could try squeezing some red silicone into the slip joint groove before assembling and installing them. It may or may not help.
Next I'd try squeezing the outer tube of the slip joint just enough with a high quality T bolt clamp to make a better seal and still allow slip. If that doesn't squeeze enough a good concentric muffler clamp should do it without clamping it too tight.
Then if none of that works you can cut out the slip joint and weld in one of those stainless bellows type expansion joints like some GHL headers used.
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