They didn't last well on my 300. It vibed as you described. Always on decel.
I custom lower isolator mount. Nice big thick piece of rubber and a sturdy bolt. Much better than the tiny stock one which was flogged out. I also put new springs on which helped. And.. My last trick. Be generous with the high temp silicone. I give the inner lip of the pipe a nice big smear all the way around before pushing the pipe on. I'm 90% certain the lower mount was the issue though. Allowed the pipe to rotate a bit and cause vibes. Now it actually holds the pipe while absorbing the vibes.
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