As most know, I have the FRPP rear exit header system on my car, M-9430-GTX.
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Ask anyone from previous rallys - what do they think?
And yet, I can cruise in any town without any looks from the local LEO's (except for wanting to look at it). I have over 66K miles on the car and have never been stopped for excessive sound; yet, at Miller Motorsports Park, when passing the Start/Finish line, the personnel in the overhanging flag post always had their ears covered when I passed under them. Compared to the X- and H-Pipes, I think the collector-racing mufflers change the frequency of the exhausr to a slightly hight pitch - between the deep-throated Ford V-8 and a high pitched Ferarri V12. I love that tone, and it is not bothersome when tracking the car - if fact, it sings a sweet song.
Personally - I haven't heard anything better...
Ralphie