I installed my vishnu uppipe about 3 weeks ago and have had a weird squealing noise ever since. It only makes the noise at around 1,000 to 2,000 rpms and only when the revs are dropping. It's weird cause it doesn't happen when accelerating or at hight revs, so I don't think it's a leak. The noise almost sounds like a bird chirping. Any help would be greatly appreciated.
-Mike

 

sounds like a leak. i think i might have one too, but its only when the engine is cold, and in idle. it goes away after the engine's warm.