Not that I know of. I'm about a day away from finishing my '77's cosmetic restoration. It has real Flowmaster 40s on a 3" system with H pipe. I have a pair of the Thrush's waiting to go on the car. Instead of just filming my '78 that already has them I was going to film the 77 first with the real ones then again with the Thrushs. Hopefully the difference in tone will show up on a video.
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