OH-MY-GAWD! Listen to this! Hyperstrada with no muffler. ***!

OH MY GAWD! I'm replacing the muffler and couldn't resist firing it up with the muffler off. It sounds SPECTACULAR! Why can't it come like this from the factory?! Or at least as an option since some folks properly wouldn't want it this loud. I had a gigantic grin plastered on my face for the entire short 5 minute ride I just took it on without the muffler. Sounds soo good and soo loud. Probably 5x louder. I'm shouting in the video and you can barely hear me. LOVE IT!!!!! IT CAN BREATH! And you can smell all of the burnt gasoline, which I love. With the muffler on, it seems to filter out all of the smell. But you can smell the fire breathing nature of this engine without the muffler!

I'm assuming there are negative consequences to the engine though for running it without a muffler? Any way to satisfy those? I seriously would love to just attach a straight pipe to the opening and do without the muffler entirely!

Next question is: how do I remove that stupid valve that is restricting exhaust flow as I twist the throttle?

https://www.youtube.com/watch?v=2SCNmHVmkPM&list=UUHbKmAkYMINsdFApJr-LC2w

sounds like a top fuel lining up at the tree! You probably wouldn't last long without a ticket in Cali.

There's some butterfly mod info on here. Think the ducati.ms site has really good threads on it. You can remove the plate and leave the bar, just disconnect the servo and leave it open, or get really crazy and drill or cut it out. I think it's sole purpose is to reduce noise emission during dynamic throttle application.

gatdammit said:

sounds like a top fuel lining up at the tree! You probably wouldn't last long without a ticket in Cali.

There's some butterfly mod info on here. Think the ducati.ms site has really good threads on it. You can remove the plate and leave the bar, just disconnect the servo and leave it open, or get really crazy and drill or cut it out. I think it's sole purpose is to reduce noise emission during dynamic throttle application.

Click to expand...

Yeah, but I'm out here in Idaho where I can hear gunfire from my driveway. I don't think there's really any noise restrictions out here. LOL!

If I remove the plate, do I also need to disconnect the servo? Or you only need to do one or the other? Which one is easier?

Are there any adverse effects to running straight pipes and/or defeating the butterfly? Will I lose HP or harm the engine?

You'll have to do a little digging here or on the ducati.ms site. I only remember what the couple members in an old thread said. I think one guy just disconnected the servo and there were no issues. If you have the can off, I'd do both.

I think I remember one guy saying it sounded different. Not better, just different. General consensus was it shouldn't affect back-pressure.

HyperstradaHopeful said:

Yeah, but I'm out here in Idaho where I can hear gunfire from my driveway. I don't think there's really any noise restrictions out here. LOL!

If I remove the plate, do I also need to disconnect the servo? Or you only need to do one or the other? Which one is easier?

Are there any adverse effects to running straight pipes and/or defeating the butterfly? Will I lose HP or harm the engine?

Click to expand...

I've spent a lot of time in Idaho - there are other people there - and many seemed well armed. Good luck.

HyperstradaHopeful said:

Yeah, but I'm out here in Idaho where I can hear gunfire from my driveway. I don't think there's really any noise restrictions out here. LOL!

If I remove the plate, do I also need to disconnect the servo? Or you only need to do one or the other? Which one is easier?

Are there any adverse effects to running straight pipes and/or defeating the butterfly? Will I lose HP or harm the engine?

Click to expand...

you can do one or the other. the easier one is to just unhook the mechanical cable from the valve. you can ride the bike normally and there won't be error codes on your dash. but errors will be thrown in the diagnostic computer/laptop that the dealer plugs in to your bike when you bring it in for service


or... remove the plate (my recommendation). with the muffler off, you can see the exhaust valve is exposed. you can access the two machine screws holding and welded to the plate. a dremel job should take care of the welds and allow you to unscrew the plate. the servo motor will operate normally without any effect to the exhaust flow, and no error codes

btw, with an open pipe, you will be running the motor lean. a lean motor is a hot motor and it will pop a lot. you may want to consider having the motor tuned with the pipe it's running on

Who/how can you tune the motor? I know some pipes come with a flash card. Can you just order a tune to load yourself?

gatdammit said:

Who/how can you tune the motor? I know some pipes come with a flash card. Can you just order a tune to load yourself?

Click to expand...

Just asked my dealer they can change the maps to lower fuel/air etc to make this happen. Basically a map mod of sorts.

I did the trick posted elsewhere here that involves detaching the actuator cable between the servo and the valve. I found that the revswould 'hang' briefly after rolling off the throttle. I decided I didn't like where that was headed and put the cable back on.

Many manufacturers use flaps in their exhaust. Some are for sound, all help to create low-mid range torque. I would almost bet you that a disconnected flap creates less mid-range torque (since the idea behind the flap is to create backpressure), and very little top end HP advantage. The flap opens back up after a certain RPM to let the exhaust flow freely.