I just have the Roush axlebacks and that makes enough noise in the morning. I live in a townhouse without a garage and leave in the mornings around 5:00am. I just start the car and drive right off, I don't let it sit. I don't want to wake anyone up in the morning but at the same time I'm not...
I'd have to say the Roush axle back would be a 4, a perfect sound for me. I think if I removed the resonator and put in an H pipe it would be to loud for my taste. I still may do that down the line when I'm used to the sound of just the Roush axle back but as of now it's perfect where it's at.