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It's Happened or Should I Say It's Happening!!!

Modern 961 Norton Commando Motorcycles

Re: It's Happened or Should I Say It's Happening!!!

Postby Precisionbob » Mon Oct 05, 2015 1:15 pm

For purposes of discussion, this is the X-pipe I have on my bike, as supplied by SBN, which is actually an x-pipe, as compared to the pic of the cat-eliminator shown in the original post of this thread. Not sure if there is a difference in performance between the two, but they are not really the same. An x-pipe in an automotive application with a dual exhaust is supposed to improve the performance.
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Re: It's Happened or Should I Say It's Happening!!!

Postby BPHORSEGUY » Mon Oct 05, 2015 1:39 pm

A true H pipe such as the stock Motad has better scavenging and there fore more HP in theory and has been proven on the dyno. When I gutted my Motad Midpipe I could look in the front of 1 side and see out the back of the other side as I reported in my New RE-Map thread back 6 weeks ago or so! The cat eliminator pipe shown in the first pic is very different then stock Motad which is a true H.

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Re: It's Happened or Should I Say It's Happening!!!

Postby contours » Tue Oct 13, 2015 4:07 pm

While we are gazing at photos of a Motad exhaust system, I am anxious to see a photo with the long version of the silencers. I am putting off my order until I'm sure of what I'll be getting. I've only seen the shorties up til now. A can anyone provide a photo of the "longies"?
:lol:
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Re: It's Happened or Should I Say It's Happening!!!

Postby potratz » Tue Oct 13, 2015 5:50 pm

Precisionbob wrote:For purposes of discussion, this is the X-pipe I have on my bike, as supplied by SBN, which is actually an x-pipe, as compared to the pic of the cat-eliminator shown in the original post of this thread. Not sure if there is a difference in performance between the two, but they are not really the same. An x-pipe in an automotive application with a dual exhaust is supposed to improve the performance.


Congrats on the new system so next step is pictures and video so we can hear it. :D
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Re: It's Happened or Should I Say It's Happening!!!

Postby NortonFactoryUK » Wed Oct 14, 2015 2:31 am

Hi guys

Just to clarify, both the stock cat section and the after market De-Cat (as shown in the first post) have a link between the two pipes joining the two sides of the exhausts.
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Re: It's Happened or Should I Say It's Happening!!!

Postby Britfan60 » Wed Oct 14, 2015 6:13 am

Contours. The long version pretty much look stock. They sound great though. Nice and deep, throaty sound without being obnoxiously loud, although I've been told they are. Video is not a good judge of sound, because if the shorties are louder and deeper, the video doesn't really capture that.
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Re: It's Happened or Should I Say It's Happening!!!

Postby contours » Sat Oct 17, 2015 8:10 am

Britfan60 wrote:Contours. The long version pretty much look stock. They sound great though. Nice and deep, throaty sound without being obnoxiously loud, although I've been told they are.


Thanks for the help, Britfan60. Furrycat said pretty much the same thing. I will go for the long silencers then, primarily because they resemble the classic Commandos more so than anything else I've seen. Of course, had I opted for the Cafe Racer I would have a different opinion. :mrgreen:

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Re: It's Happened or Should I Say It's Happening!!!

Postby bushman » Wed Apr 05, 2017 10:19 pm

I decided to tackle making a cat-eliminator myself using off the shelf ready made parts. I am going with a traditional H pipe for better torque rather than an X pipe.
Picture is after 1/2 hour of cutting and fitting the 1 3/4" x 0.065 SS pipe. Next step will be fabrication of the cross over joiner and the hanger bracket and TIG welding together. Then polishing. I will probably polish the two pipes before being welded at the join/cross over

I ordered the off the shelf materials from SPD (Specialty Products Design) in Rancho Cordova, CA. It is all 304-16g seamless stainless steel tube.
2 x MCB25175-30416 this is the only bend a 25deg Merg Collector bend $29.33
2 x TE175S16-14, this is a tube extension the 1 3/4" expanded at the end to slip over the header $29.78
1x ST18816-304 SS tube, 1ft $15.00
This shipped in 2 days - total around $150 incl. freight. Price here in Canada for the X pipe is $605 plus tax, shipping etc.

With these items, welding is kept to a minimum and the clean flowing lines of the pipes are kept.
I will post the progress over next few days.

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