Sancho805

i think the manny muff is the one to get. if the theory is true that auto muffs suppress sound a bit more, then a manny muff is what you want since it will be a tad louder and a tad better flowing, though not much. JMO and JMG (just my guess).

07PonyVert

I think we're just looking at a sound difference, and nothing else. I can tell you that I took a couple of pics and it matched the one with more vents so they're manual mufflers. That means I've got exhausts from a manual on my car with an automatic tranny and so far, I haven't had any issues or problems...just some nice low rumbling .

Getting back to the mileage posts, mine is a daily driver, but I treat her like a garage queen!