Dude, my old MKIII sounded like that. What exhaust do you have? Sounds sweet. I had a 3.5" GT-SPEC catback. I like the wheels, too. :bigthumb:
Kinda off-topic: About the compressor surge, my Celica has always done that. When I close the throttle, I can feel a lot of air coming out of the Blitz DD BOV, but it doesn't sound at all. The sound comes from the compressor. But air doesn't come out of it, it just sucks harder when I let go the thottle.
Adjust your bov. It might not be opening. Compressor surge makes the compressor wheel spin in the opposite direction causing that noise. That noise happens when either you dont have a bov valve to release the pressure or your bov needs to be adjusted or is not working.
It's opening, man. I've adjusted it already. It releases a lot of air. I feel it with my hand. When I put my hand on the compressor inlet, and let the throttle go, it'll suck harder for that moment. I don't feel ANY air coming out. I put a piece of paper on it with a screen and the paper got sucked harder once I let off the throttle. I don't get it. Why does it make a purging sound if it's sucking air and not letting it out? If it was the bad surge, don't you think that the turbo would've been dead by now? 4 years at 15 PSI should be plenty of punishment for a compressor surging. It should be broken by now...hell...long time ago. I don't understand.
Sorry for the late reply's guys, just been caught up with Uni work,
The wheels are Raching Hart cr's in custom offsets and yup they're 19's,
Bov is Sard R2D2, Exhaust is the Tanabe RM, the turbo is a T67 with an A/R of 0.68. This combination of turbo size and A/R size is perfect for the 6 Speed, lag is minimal, it spools noticeably quicker than TTC. All I need now are cams