Maroon 57....I noticed more front end torque with the Cat Back. I have greddy so it wasn't really any louder. With the Intake definitly more engine noise. But it is pretty tight. Little more front end torque. In the higher RPMs like arou 4-5 you notice the increased HP. Of course there is also fast acceleration. You can notice it but it isn't extreme. It is pretty tight. Good luck. Let me know how things work out.