Switchable exhausts are quite an established thing on cars...

[Taipan]

...but will this make them so on bikes?

[v8-powered]

Good idea but looks shit

[MrLongbeard]

Nothing new.
I considered a system for the Harley many moons back but decided against it as it was fully EU ECE compliant and TuV approved, oh and costs started at £2k.

https://www.jekillandhyde.com/en/brands ... on-exhaust
https://www.bennetts.co.uk/bikesocial/r ... t-breakout

[Mr. Dazzle]

There've been switchable exhausts on bikes for decades, they've just been focused on performance rather than noise.

[Taipan]

Who remembers the Quill exhaust that had that ball in chamber design? As the revs built and more gases were put into teh exhaust, it moved a ball thing out of the way and the exhaust became a sort of straight through, or something like that. I had one ona CCM and it was pretty good for sneaking past Plod but volume when you wanted it.

[.....]

Yoshimura used to have a sprung flap on some of their pipes before the end can, a very primitive exup system, but it complied with whichever race series they were in!

[Dickyboy]

Got an exhaust valve of some sort in the cbf1000, not sure what it does apart from getting seized and messing up the running of a great motor after a while. That monstrosity up there can certainly get in the sea.

[Bowman]

https://vandemonperformance.com.au/prod ... on-muffler
This seems like a pretty good effort.

[Jody]

I would love to be able to quieten my exhaust, particularly when riding through tiny streets with high buildings either side.

I've just repacked my exhaust, unfortunately I didn't buy enough packing material, so now its noisier than ever

Next delivery of exhaust packing early next week I hope !

[A_morti]

Who remembers the Quill exhaust that had that ball in chamber design? As the revs built and more gases were put into teh exhaust, it moved a ball thing out of the way and the exhaust became a sort of straight through, or something like that. I had one ona CCM and it was pretty good for sneaking past Plod but volume when you wanted it.

I had one on my CB-1. They called it a T3 silencer and they sounded great with a real on/off switch around 4500rpm. Especially handy for a small IL4 where it was quite easy to enjoy the noise at legal speeds, or choose not to.

I bought an oldish Quill can on eBay for my CBR250 thinking it would have that, but it's just a basic absorption silencer. But it's whatever came after, the Evo2 I think. It's still a bigger volume silencer than a normal bean can so it sounds decent, albeit it's not what I had it mind.

These days Quill is just another brand name for MTC exhausts. They aren't anything special technology wise.

It's a damn shame that technology was lost.

[A_morti]

I would love to be able to quieten my exhaust, particularly when riding through tiny streets with high buildings either side.

I've just repacked my exhaust, unfortunately I didn't buy enough packing material, so now its noisier than ever

Next delivery of exhaust packing early next week I hope !

You can get dB killers that look like catalysts which go before the silencer. They knock off a few dB's, might be enough to do what you want.

[JackyJoll]

Good idea but looks shit

Looks like a kitchen gadget, from bid-up TV.

[McNab]

Thornton Hundred have been using Jekyll and Hyde exhausts on their Triumph Bobber builds for a few years now.