Hey there all, having a bit of a mare!

1)Have just had a ss downpipe fitted (by dealer) to sti v and have noticed a strange noise, between 2-4000rpm. Would downpipe cause this? Noise doesnt allways happen, mainly on light throttle. Could it be a heat issue? am cutting and fitting heat shield at weekend. Also the air across bottle/ dumpvalve thing ive read about, could it be that? and how can I tell.

2) Been out for a drive and have noticed a noise, I think from the front left of the car in tight right hand corners, roundabouts.

Hope someone out there can advise.....