Last month, I had the Vishnu Stage 0 kit installed on my car at Diablo Imports. They are an approved Vishnu Installation center. I have done my own work on the car for the other mods, but as I heard so many war stories about uppipe leaks, I figured I'd take to a professional and not have to worry about it.
So a week or so after the install, I noticed a slight screeching noise (not even that really, kind of a whistle) on full boost above 5500 rprm. I took it back, they tightened things a bit, but the noise was still there. Two days ago, I took it back, the tech disassembled everything, uppipe, downpipe, etc. and installed new gaskets. He test drove it, said the noise was gone. I revved it to 6k on the way home, didn't really notice it. A day later, driving the car hard, the noise is back.
This is starting to irritate me. Not the noise, it's a small thing, not loud, but I'm just concerned if it's really a leak or not. I'm getting full boost in all gears (.9 MPa in the lower gears to 1.1 MPa in 5th), and it doesn't feel like I'm losing power. There is no rustling noise or other sound as some have reported is indicative of an uppipe leak.
Can I hurt my turbo by continuing to drive it like this, if it truly is a leak ? What do ya'll recommend, check it out by removing the heat shields and doing the smoke test ?