JC Whittney has side pipes, up to 72" I believe. They are just a long glasspack, and sound awesome. Great flow. Had some on the ol' lady's 86 Dodge diplomat ( former cop car ) with a 318. The side shields on these has realy cheezy crummy chrome though. Looks great until it gets wet a couple times then it's time to grab the high-temp flat white rattle can and cover them over.

As for Dynomax, I have a set of their big glass pack turbos, with offset inlet/outlet. Never really liked them.