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Neither have I........mainly cause they are noisier than the cast iron manifolds along with all the reasons you've given
I agree with teamcurtis. Don't get too fancy. Here's what I'd do and have done: Find a set of long-tube headers (4-into-one, or 4-into-2-into-1; stay away from shorties or block huggers unless you find them inexpensively), use 2" exhaust pipe for your exhaust, turbo mufflers which are low cost, and have your exhaust turn down and dump either right before or right after the rear axle.Muffler shops usually charge by the foot for the pipe and by the number of bends plus labor. The above-described system should be very cost effective. By keeping it simple, you should still get a good and effective exhaust system at a good price. Save your coin for an upgraded system for your 6.2 swap.If you think the slight increase in noise from the headers is objectionable and there is too much heat from the headers, you can wrap the headers with that high-dollar header wrap and use ceramic spark plug boots to protect your plug wiring.Just my $.02 worth.Rusty