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but why can't the come up with a good muffler system??


They can but it costs some engine power as it takes some effort to push the exhaust gasses out through a proper muffler system. Ergo, it is the first thing powerboat owners take out if they are in the hunt for maximum raw power. And in jet skies raw power ratings sell craft just like motorbikes (another vehical that sometimes could do with a better muffler system)

Wouter


Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands