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It almost sounds like an old school carb'd motor while under acceleration, has a hissing like sound, mostly while accelerating uphill, the exhaust also got louder, sounds almost like a turbo'd engine while under acceleration with or without the hissing sound which comes and goes. I was wondering if anyone else has this issue, I tried looking around while I had it on the lift last week while doing my oil change but everything appeared normal. I tried taking a video of it but it didn't really pick up on the audio...
 
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