There was an article about it several months back in MM&FF, basically it was about using both to cover up the weak points of both systems. It boiled down to using the properly sized unit for the application in either system and compounding was unnecessary. It actually showed that more power could be made without compounding. Big rigs have had them in the past but I don't recall any in use now.
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Proud owner of 93 Cobra #1928
306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards
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