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Has Anyone De-Baffled their stock exhaust?

MasterKraus

Just got it firing!
GT Contributor
Joined
May 5, 2015
Messages
6
Location
Philadelphia, PA
Hey All,

Brand new V7 Stone owner here! Glad to meet you all. Looking through exhausts and will probably end up with an Agostini at some point. However, in the mean time, has anyone de-baffled their stock exhaust? Looking for a bit more sound while I wait for the engine to break in. Once I have a few thousand miles on it I'll do a proper upgrade.

Photo of the new baby attached.

Thanks!

Chris
 

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I wouldn't recommend it. These engines do need some back pressure to run correctly. Also anything you do the exhaust will require fueling modification.
 
Brand new V7 Stone owner here! Glad to meet you all. Looking through exhausts and will probably end up with an Agostini at some point. However, in the mean time, has anyone de-baffled their stock exhaust?
Hi Chris, welcome to the GT Forum and Famiglia... and congrats on both new little ones. Muffler designs internally have gotten pretty complex. The days of simply drilling them out, are long gone. I haven't had a new set apart yet, but they do contain both catalytic converters, in addition to a multi-chambered baffle system, wrapped with steel wool I suspect. If you cut them apart, this is what you'll likely find... enough to wonder how exhaust can even escape. If you can weld/do it yourself, go for it, otherwise know that it will be fairly complex and time consuming for anyone else to do it. Best to save the money and just upgrade when ready (and be sure to check out my GT-Rx® exhaust offerings here on the Store; https://www.guzzitech.com/store/category/exhaust/v7-small-block/)
Also, as John noted, fueling revisions are mandatory. I offer my re-flash service as well; https://www.guzzitech.com/store/product/gt-rx-v7-miu-reflash/

Lastly, hope you'll add your info to the Registry; https://www.guzzitech.com/forums/threads/v7-registry-picture-thread-add-your-bike.9108/ -- post often.
 
I have to second what Instg8r just said.

As a new V7 owner, I have to say Todd's GT-Rx ecu flash is a must. I took ownership of my '14 V7 in March and I was a little hesitant on pulling the trigger on it, despite all the posts and rave reviews on it. A $300 scratch off ticket winner on the day I was debating it finally convinced me to go for it. Factory stock with no mods, I had Todd reflash my bike. I can't stress how much of a better experience a new V7 is missing straight from the factory. No more low speed jerking and pulling, a smooth, even throttle response, temperature off of the engine was noticeably much cooler, no longer having to wait a few minutes on start up before heading out on a ride, and overall the bike just sounds a whole lot better. It really opens up the bike's personality in to a more aggressive, "get your heart pumping", intuitive motorcycle.

As far as exhausts are concerned, I also took a look at the Agostinis, Mistrals, etc, and finally decided on the GT-Rx full system setup and I'm really glad I did. The quality is top notch, the price point is great, and it's locally manufactured and fabricated out here in California.
With the new exhaust system, the bike pulls even harder and faster, and I find myself having a hard time trying to force myself not to really open it up at every chance I get, since I'm still trying to limit my RPMs since I'm in the break-in period. The exhaust note is beautiful. Not overly loud and obnoxious, but that perfect grumble. I was really impressed by the sound of it. It's reminds me of that perfect small block Chevy rumble. I went with the polished option since I figured it would really compliment the Special's injection covers and grab bars. I think it turned out great and attached a few photo's below. Sorry for the quality at night, although I think Todd might have some better ones out in the daylight. Just my two cents, I think a black ceramic coat would look pretty killer on your black stone...

Congrats on the new ride Chris!

FullSizeRender IMG 0902
 
Thanks all for your comments and advice! I really love the sound clips of Todds 2-2 design. Does anyone have any good pictures of the black ceramic coated?
 
I wouldn't recommend it. These engines do need some back pressure to run correctly. Also anything you do the exhaust will require fueling modification.

Sorry, but You don’t specifically want or need to impede the flow of gasses escaping from the cylinders.


That’s Not to say that our Hacksaw / Hand drill “Enginnering” May counteract some of the enginnering that went into developing the exhaust on our bikes.
Like some of the targets those engineers had to meet related to sound and particle emissions.
 
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That’s Not to say that our Hacksaw / Hand drill “Enginnering” May counteract some of the enginnering that went into developing the exhaust on our bikes. Like some of the targets those engineers had to meet related to sound and particle emissions.
This thread is 5+ years old... However, I'll play... Stock mufflers have very complex baffling. Yes you can cut them apart and rebuild them from the inside out. I've been involved in doing this since circa 2001 or so on the older Cal 1100 models. Waste of time and $ unless you really must have the overweight and obnoxiously large stock mufflers.
On the video above, the Ford GT (one of my oldest and best racing friends was the PR exec for this car at Ford Detroit), uses a 3.5L twin-turbo motor, so spent exhaust gases are expelled by turbos - toss that video out in ignorance, I won't even waste time watching it.
Where exhaust design/mystique lies is in positive and negative exhaust pulses and the effects of the tubing size and length it exits through.
Quite honestly it's quite astonishing that any stock Guzzis run at all through the plug of stock mufflers.
 
I was looking for forum posts related to modifying the existing exhaust while I’m shopping for a replacement, I should read the posted dates first ;)

Indeed there is a difference between what’s going on with the exhaust in a turbocharged vs. Supercharged vs. normally aspirated engine, in any case there is best case for getting the exhaust gases out...

There is another good video by an engineer at Magna flow on design goals, constraints and compromises
 
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