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I thought I'd post again. had a loud groan at steady speed which was fixed by dealer. They "neutralized" the exhaust. Groan is much quieter. However, I have a shudder when accelerating or going uphill. It is very noticeable of the freeway. I've tried premium gas. Dealer says I do not have a...

I have an issue that Ive heard somewhat described by others. I thought I should explain. When pressing the gas pedal to maintain speed from 60mph to 70, my engine sounds very loud. There is a distinctive groan or deep buzz. This is my 3rd 2.7 and second with the 10 speed. I've never had this...