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I was slightly mistaken with my explanation, the difference is to compensate for the valve, which helps keep the sound down, which is why the Ver5.1 is slightly louder.  The newer Ver5 series is not as loud on the low end of the RPM range, which was a complaint of some customers and the reason many switched from 3 and 4.  It's also the main reason the exhaust with the valve system was the first Ver5 to be sold.  All have a distinct GT-One original F1 sound but you can make them cry with a tinge of Titanium...

DJ


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