i went to this, it was a great day. i think i got a few pics, not of any rollas though. :y: just the wagon, - the rear bar. lol. we got quite a good collection of pics happening on auszoku. worth a checking out of.
sometimes if a ground is bad you will get rev noises affecting your stereo. perhaps you could try re-attaching your ground somewhere else on the car. any part of the chassis is fine.