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Discussion Starter · #1 ·
My cars a 99 rs and it sounds like a normal subaru in idle, low rpm or high rpm.But when you push the throttle down more then halfway it does a real loud and annoying sound making the car sound exactly like a lawnmower. I assumed it was an exhaust leak but in idle it sounds fine and cant feel any hot air leaking out of anywhere. Changed the exhaust manifold gaskets, the front pipe-front cat gasket, back cat- back pipe gasket was fine, and changed the pipe-muffler gasket with no difference at all. Anybody have an idea on what could be causing this?
 

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2001 Impreza STM Coupe
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Did you ever figure this out? I installed borla replicas and test pipe, get the weird farting sound from tail pipe. Only when I hit the gas. I want to know!
 
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