The Quiet Flowmaster?

does the noise fade away at about 40-45mph? if it does i feel your pain. i just got the tti 2.5 x system on mine and it is loud inside until it reaches about 40-45mph then it quiets right on down. i have had many different type of exhaust systems before, but none have done this. reminds me of a header exhaust system i had on a 69 chevelle ss. pipes exited just behind the door with straight thrush mufflers. very loud!