alum 1 pc driveshaft woes... is this sound normal???

[tastyratz]

so I have a 1pc driveshaft I purchased from luisgonz and put in my car. Now my car has a problem where it sounds like it almost might even be resonating inside the DS itself at highway speeds and light throttle. around 70-75+ mph and steady hold or slightly decel level throttle my car makes this god aweful sound. almost like people who lick their fingers and run it around a wineglass type sound.

I have an attain 3 inch straight titanium exhaust (n1 style) on my car with a 3 in test pipe and dc sports headers on my NA KA. This is extremely annoyingly awefully loud and this is much louder and noticible over my exhaust!! anyone else out there have one and can comment on this? any other ideas or suggestions to help this short of pulling the thing off?