I bought the Akrapovic race system from Kawasaki for my H2. It's titanium rather than steel, a larger diameter right through from the headers to the muffler (you will need a bigger diameter muffler too) and it has no catalyst. It does have the threaded boss for the lambda sensor and fits straight on with a rather nice carbon fibre hanger. You save at least 10kg in weight.
I run at Straightliners meetings doing standing miles and there's a noise limit. Mine measures between 95 and 98dB from meeting to meeting with the baffle out. The bike has done many full throttle runs over the last few seasons with no problems like on the Vandemon. The sound is quite sporty without being annoying, obviously this depends on how you ride.
Actually you donít need the bigger muffler, I bought the same system as you Bob complete with the wider diameter headers but made to fit the road legal Akra supplied with the UK H2.
As you can see from the image the pipe exit is crimped to fit but you need to order the correct part, Calsport can help with this, theyíre good guys.
Agree that itís has fantastic build quality, perfect fit with lambda & it has plenty of character but doesnít make your ears bleed.
Also if you insert the baffle it will go straight through a UK MOT.
The Vandemon obviously looks better but the sheer noise and grief with MOT (and talk of failures) would put me off.
TBF there is plenty of choice with Austin, Akra, Vandemon, Brockís & Yoshi to name a few
The 2019 standard system (complete with cat) is louder than the standard system on my 2016 but I believe the silencer is different and the system is visibly different from the headers down.
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