I've been driving my '65 'vert a bit since the new engine (about 325hp) went in, trying to put some miles on the break-in oil so I can change it. I like the new additional power but I am not happy about the new additional sound. My mechanic, who's into muscle cars, thinks it sounds great and I'm sure a lot of you guys would agree. Let me explain. I am retitired so I don't go to work daily, but I drive my Mustang as often as I can. I use it for everything, it's my car. It's not a car that sits in the garage and gets drivern 20 minutes to the car show. On top of that I like to listen to mustc when I drive. There's a cd player in the glove box, a pair of speakers in the dash and a pair of Boston Acoustics bookshelf speakers on the floor behind the front seats. I want to hear the tunes when I drive, not the engine. It's a cruiser, not a show car or a racer. Now I know a lot of guys like their car "fast & loud". I want my Mustang to be more "fast & quiet". Not silent (I know it's a 56 year old car) just a lot quieter. Has anybody accomplished that in their 65/66? What mufflers did you use? I'm currently using turbo style mufflers and resonators at the back and at 2,000 rpm or higher it's too loud. Like I said, it's a driver, a cruiser, a car I live with, not just drive for 20 minutes once in a while. It's got plenty of power so I don't mind if I lose 5hp if it means I can hear my tunes. Can it be done? Can my Mustang be fast & quiet(er)?