eh, i feel like i lost a tiny bit of low end, but i lost a lot of that with my headers, so idk how that changes it. when i'm cruising at 35 and hammer it, it definitely pulls much harder. accelerating on the highways are stupid now. huge difference. overall, i like it, but i'm definitely still craving more speed. saving for my top swap now. slight sound difference. just sounds like there is a full air sound. some people compare it to being in a tunnel, but i think it's more subtle than that...