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Jul 13, 2026
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My car has 53,000 km on it, and it has been running a Stage 1 tune for about 8 months.

For the past month, I've felt that the car has lost some power and has become inconsistent under acceleration, so I took it to the dealership. However, the service staff told me everything was normal.

Yesterday, I took it to an independent mechanic, and he noticed something interesting. For example, when cruising in 4th gear at around 1,800 RPM and then pressing the accelerator, there's a brief squeaking/creaking noise—almost like a piece of metal flexing—and then the noise disappears immediately.

Has anyone experienced something similar? I've read on a few forums about issues related to the wastegate actuator rod, the wastegate actuator, or a loose actuator rod clip.

I'd really appreciate any advice or if anyone has had the same problem.
 
The cause of the noise has finally been found. I removed stage1 because of it. But, the problem turned out to be something completely different. The exhaust heat shield had bent, and it was making this noise under load. Since I had mentioned all the possible causes—including the wastegate, engine mount, and exhaust—the service center checked the exhaust as well and found the issue. If you ever come across a similar situation, it might be worth inspecting the exhaust too.Thanks all for replies