Thanks for all the replies. I am not looking for obnoxious loud, just a mellow tone. I ride my son's Yamaha Raider 1900 with straight pipes and a tuner, that is very loud!!! I have experienced a local idiot on a crotch rocket that feels the need to rev the engine as he passes you at a high rate of speed, not pleasant, he will be dealt with by the local authorities or hopefully a deer will jump out in front of him!!! I live out in the country and drive the vehicle a couple times a week, noise is not a concern.
PS Greg, had a DynoMax turbo flow on my 08 Nissan Frontier 4.0 6 speed manual, very mellow.