I replaced mine as well. Mine woodshed like a turbo building boost. It isn't as bad, but still leaks. No ticking noise though. Is the ticking from the exhaust butterfly? Mine is very mild now...but I tried adjusting it 10 times without luck.
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Mine never "whooshed", just a light tick at startup that goes away after about 30 seconds once the pipe gets hot. The original was corroded and I could see where it was leaking condensation, also got under it and could hear the air coming from it on cold start so I know that's what is leaking.
When I did the replacement I think my issue was I didn't push the two halves together hard enough because I don't have anyone to help - it really can't be done by one person and have it seal. You need someone else to push forward on the back half of the exhaust to REALLY mate the ball and socket ends together just right. If not, no matter how much you torque that Norma clamp bolt it will still leak (ask me how I know).
I haven't looked at the flapper...I'm considering bolting it open when I do get under there again.
I still haven't gotten under there to take it apart and try the Permatex yet. Hopefully this week.