I haven't heard of any company doing the 5" duals. I am pretty sure that with 4" duals, you can only put a stock sized tire underneath. If you need an exhaust that big, you might think about stacks.
you can custom make your own with a Kenworth y-pipe some elbows, clamps and some hangers and your set i saw a PSD with this set-up and it looks killer hope this helps!!!
Tom
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