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6 series muffler modification/upgradte



I have an 88 M6 w/ 40k miles that is going to need a new muffler and I
think the catalytic converter (the hanger has broken off) . Anyone have any
experience upgrading to a better muffler (or have any suggestions)?  I've
heard tell of FreeFlow but I suspect that is for off-road use. 
Thanks
George Cooper