I'm running straights on my 350..and how sweet they are....but back in my younger days when a 6cyl was all I could get my hands on I ran splits with a Smitty glass pak. Even one Smitty had a nice tone and as they burn out they get a little louder. I bought two new smittys for my 37 but just can't bring myself to put them on..even after 2 years.
