damn grinding/rubbing/rattling noise around 2000rpms

Guys,

I have this annoying rattling noise around 2000rpms ever since I put on my offroad h-pipe on my 03 cobra. I have flows out back. Now the noise only starts when I let off the gas and around certain rpms, 2000-2500rpms. It is kind of a rattling noise that is either coming from my h-pipe or flows. I took it to the delaer, and they said that aftermarket mufflers will do that, bull... Then I took it to the shop that installed my h-pipe and it was rubbing at the back by the flows tubes. So I drive home and low and behold, I hear this damn noise again. I look under the car and it is not touching where it was before. I aslo get this when I am making a turn. Anyone have this problem, any solutions????? Peace!
 
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