SuperTrapp Mufflers

Anyone ever use SuperTrapp mufflers to quiet an open exhaust system? This would allow the use of original-style racing exhaust for track use, then install SuperTrapps for the street.
 
We have and we found that to get to acceptable noise levels for Goodwood, using them also severely strangled the power output of the car...:(

But for road use where you would'nt require perhaps all the normally available power ;) it might have been ok...
 
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