I just put a pair of 3 chamber flowmasters on my car with 2.25 inch exhaust. They sound nice but there only deep in 1 to 2500 rpm and then they mellow out. I was wondering if over time the mufflers with break in and get a little louder? I was also curious if i took my upper cats off if the flowmasters would sound nicer and would it be worth the power? thanks