Not at all. Like i said, its barely noticeable at highway speeds. I notice a slight rumble. Once you get into it it really sounds good. I can send you a video if you’d like.Thank you for those details. I have two flapper valves, one on each side of the muffler! I'm thinking I will leave them both if I do the muffler delete.
Not to beat a dead horse but can you tell once the AFM kicks in... and if so would you describe it as the "helicopter sound" I have heard referenced by others? Just worried that it would be annoying and debating if it is worth the trade-off. Love a decent V8 rumble, especially after coming from an Ecoboost.