Spohn Performance torque arm question

I had a Spohn Performance torque arm (crossmember mount) installed on my 1993 Trans Am last year, and ever since I got it it's been making all sorts of loud/annoying clunking sounds (usually after stopping at intersections, etc). I'm wondering if this is par for the course or if there's something wrong with it? Anybody else out there have one?

Thanks,
-Mark