I'm glad to hear that is the result you observed. I added quiet baffles to my V&H oversized 450 Titans and I don't have enough experience to notice any difference. This is my first Harley Davidson and it all sounds loud to me. I'm not surprised you get more back pressure and lower end torque with the quiet baffles, I could see right through the original V&H baffles. I like the look of the big 4.5 inch Titans.