LV One Exhaust:
I saw one of these going fairly cheap on ebay (they had a few, might still be available) and found the stock exhuast made me reluctant to rev beyond 5k and didn't sound like a 1/2L bike.
I liked the youtube clips (with phone cams, so not a fantastic help with the sound) and that with the db killer it passes some uk regulations. I'm wary of the bike being obnoxiously loud, I like a good sounding exhuast, but loud isn't for me.
LV One installed (and debadged before installation):
The stock exhaust does not include the db killer. Lots of boom at idle, lots of burble when backing off the throttle at cruising speeds. 80% throttle was throaty and full throttle has a lovely crack, esp in the higher revs.
The exhaust was too loud for me, I may warm to it, but I'm a mid 30's guy and don't want to turn heads for the wrong reasons.
With the db killer, there is still a lot more low end rumble which is what the stock exhaust really was missing for me.
No more crack and brapp at full throttle, the burble coming off the throttle is still there which is lovely and it sounds mostly refined over all. A good compromise for me.
Changing out the stock sleeve for the db killer was a bit of a pain, the stock unit was jammed in there and the bolt hole on the db killer didn't align 100% and needed a few mm of lengthening. Otherwise the design, documentation and finish of all the parts was very good and the main install took the 20-30min it should have.
Happy with the aesthetics, slight weight improvement and most importantly the noise which really was working against me using the fun part of the rev range.
Happy to provide more photos if anyone has interest.