I am new to cars and trucks and have just purchased my first truck, a 2000 Ford Ranger Sport 6cyl 4.0L. I have been told to purchase a flowmaster 40 for it to make it deeper and louder. Im very new to all this and not sure which size flowmaster 40 muffler to get? And is the installation easy or very complicated? Can someone send me a link to the Flowmaster that would fit my truck?