I run Fentons through 1-7/8" ID pipes into 22" cherry bombs. They sound fine up to 2100-2200 rpms. After that they are FIERCE! An UnGodly racket that is an absolute cop magnet.
I would strongly recommend that you consider a chambered muffler...FlowMaster, DynaMax, etc, if you plan on driving your stock geared truck over 45-50 mph.
Several folks have touched on the benefits of Fentons....they also include provisions to hook up a manifold heat plate that is essential for adding heat to the intake manifold. Hope this helps.
