I have a 98 gt and last week I added flowmaster 40s to the exhaust. I was so disapointed at how quite they were, they were just a tad louder than stock and a little deeper. I love the sound when I can actually hear it. So I have decided to get rid of the factory h pipe. But I cant decide if I want an h pipe with or without cats. My main concern with not using cats is the check engine light coming on. I know they make mil eliminators but does anyone know how well they work or how hard they are to install. I just want a deep tone, loud but not so loud I cant talk in the car. Will the 40 series flowmaster and an off road h pipe provide me this sound. I live in ky so I am not tested ever for emmisions.