I developed this same noise on my 2008 Bullitt. It started to surface after I installed my roush stage 3 suspension. I did some searching around and found this thread and read some other sites.
I decided to buy a set of GT-500 strut mounts from Jegs, they were the Green stud mounts.
I had the dealer do the 07-18-02 TSB today.
I took the car home... did 4 or 5 145+ runs on some crap roads. Drove over roads that would always make the thunk in the same spot.. like clockwork.
No thunk now.
I hope it lasts.
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