I bought these for a 2005 Dodge Magnum RT and bought the wrong ones first. The Magnum requires 2.25 displacement on both sides, but because the guy who made it knew what he was doing, he easily made me a custom exhaust for the car. Secondly, there are respirators in my car that muffle the sound of the exhaust a bit. I thought maybe having two of these instead of the standard trunk muffler would be right for great sound, but not enough to go overboard on ventilators. I will never discount an item that I ordered wrong or had high hopes for, so overall a great item.