I have the reg 40 series in my 4.6 94 Grand Marq, 2.5" pipes, true dual in turndowns under the center...I like how it sounds (NICE rumble kinda similar to a truck), but it could be a bit louder with that same rumble IMO. I don't know how much more power your motor has, or how much more of a performance motor yours is than mine, but i've heard that the Super 44s are actually quieter than standard 40, and I've also heard that they're much louder. I'd do more research, maybe just contact Flowmaster directly.