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Discussion Starter #1 (Edited)
Hello everyone, this is my first time posting on here and I apologize if this is the incorrect forum or place to be putting this. I just recently got a 2018 sti and every time I’m in 1st or second gear and start accelerating WOT after about 3k RPMs I hear this really loud rattle sound. It sounds like it’s somewhere under the car towards the back or center. Very hard to pinpoint it. I can’t replicate the rattle in any other gear besides 1 and 2. Please help 😭 Its freaking me out

https://drive.google.com/open?id=13n2lUILpLEYmNLV8j1L_Tvj3OA78DWs0

Here is a video
 

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I had a similar sound in my 19 STI but it was somewhat constant. Turned out to be the heat shield above the exhaust in the center of the car. One of the 4 bolts came loose and fell off causing that corner to rattle against the car producing a very similar sound to yours. Your rattle does sound a bit more pronounced though. May be a good idea to jack it up and take a peek.
 
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