That used to be my exact setup, for about 2 1/2 years. I honestly loved the sound. Sounds even better than straight pipe I thought...I often thought it sounded very close to straight pipe, but without that edge that you get with it. Trust me it sounds really good.I have a 2007 5.9 currently with a muffler delete and I am looking looking for it to be a little louder. Anyone know how it would sound with an aero 4040 and no cat??
I got the 4040 installed today and the cat taken off. It sounds awsome and is pretty comparable to a straight pipe just without the raspyness and not any drone on the highway at about 70mph. Gas mileage went up from 18mpg to about 21mpg with mix driving.Keep us posted. I want to know what you think. The 4040 does sound very nice, and if you want loud, then take the cat off and you will hear loud. :thumbsup: