Its coming fromt he front passenger side and has only started happening since the install of my DMS springs, it happens when going over bumps, its a clunking noise, any idea as to what may be causing this?

 

Sounds like one of the front rubber bushings from your pass side is bad or gone. It didn't happen on my Z but with my previous car.

When I dropped my ford tbird, everytime I went over a bump or braked really hard, I heard this loud clunk. I went to a realiable shop and they showed me the problem. If the bushing is bad the front tire will shift a tad making the sound. Mine was just really worn out and happened to bust at that time.

Hope this helps.