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  #1  
Old 3 May 2011
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2 into 1 exhausts

Metalmule do a 2 into 1 exhaust for the Yamaha XT660R. I am going to go down there to see if it will fit my Aprilia Pegaso Trail (a long shot even though it is the same engine, but you never know).
Assuming it does fit; what are the potential problems of replacing the existing 2 exhaust set up with the 2 into 1 system? Considering that the header (if that is the right word?) pipes along with the actual cans would be replaced?
Would the fuelling change and fuel economy suffer as a result, for example? Please pretend you are explaining it to a total mechanical idiot (in fact, no need to pretend). Thanks!
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Old 3 May 2011
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Quote:
Originally Posted by wuming View Post
Metalmule do a 2 into 1 exhaust for the Yamaha XT660R. I am going to go down there to see if it will fit my Aprilia Pegaso Trail (a long shot even though it is the same engine, but you never know).
Assuming it does fit; what are the potential problems of replacing the existing 2 exhaust set up with the 2 into 1 system? Considering that the header (if that is the right word?) pipes along with the actual cans would be replaced?
Would the fuelling change and fuel economy suffer as a result, for example? Please pretend you are explaining it to a total mechanical idiot (in fact, no need to pretend). Thanks!
Being a single, I can't see you having problems with scvenging the way you might on a twin, say.

The biggest problem is the possible need to re-jet to richen up the mixture, assuming the new system breathes more easily.

You might want to look at Laser.

I had a Dommie NX650 that was a sinngle with two end cans. I bought a Pro-Duro can from Laser and their 2-1 collector box section. Total £220 or so. Sounded great, easy to fit, built for the job, by a dedicated exhaust manufacturer!!
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Old 3 May 2011
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Headers is the American wording for manifold. You will probably lose torque and gain a little bhp at top end. Depends what you want.I have a 660 Tenere and love the amount of torque and wouldnt want to sacrifice that for a few extra horses. To me the cost against gains isnt worth it but like i said, depends what you want.
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Old 3 May 2011
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Mtc

Before laying out a considerable amount of cash, maybe take a look at these boys.
I've just ordered a 2-1 and silencer for my XT660Z Tenere, from the gallery pictures and reports they are pretty good. For a considerable amount cheaper with lifetime guarentee! A 2-1 header, silencer and all fittings in Carbon came to £265.00

MTC EXHAUSTS

I don't work for these guys, they just have a good product.
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Old 4 May 2011
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Assuming it fits correctly or you buy another unit that is built for the exact bike there is nothing to loose, performance wise. 2 into 1 is better. As others have said you will have to change jets to compensate.
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Old 4 May 2011
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Thank-you for all your replies. Much appreciated food for thought. I have emailed MTC for more info. Don't really want to lose torque on my bike; more looking to save weight, any extra horses would be a bonus. I am also getting a bit obsessed by fuel economy, so don't want to reduce my MPG.
Any further thoughts very welcome. Cheers.

Last edited by wuming; 4 May 2011 at 09:42. Reason: typo
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Old 4 May 2011
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Power Commander

With the rich/lean issues and as I have a PiperCross filter too, I'm putting in a PowerCommander to compensate for the fuelling issues. Hopefully it'll keep, if not improve the fuel economy.

And with any luck get rid of or smooth out the ridiculous throttle surge that new fuel injected XTs have!
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Old 6 May 2011
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Quote:
Originally Posted by wuming View Post
Thank-you for all your replies. Much appreciated food for thought. I have emailed MTC for more info. Don't really want to lose torque on my bike; more looking to save weight, any extra horses would be a bonus. I am also getting a bit obsessed by fuel economy, so don't want to reduce my MPG.
Any further thoughts very welcome. Cheers.
I don't think there will be any disadvantages to changing other than the cost.
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Old 6 May 2011
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what about the reverse?

I am looking at getting rid of the stock exhaust on my Cagiva Elefant 750 and using two campbell end cans I have lying around. What would the effect be of changing from 2-1 into 2-2 with no collector (i.e. both straight through) and do I have to calculate the correct exhaust volume for this set up - assume it's not as important as with a 2-1-2 set up?)

Cheers
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Old 9 May 2011
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According to what I can find about V-Twin exhausts from my mates the collector (or connector between two pipes whichever is the plan) has the most to do with midrange torque. Having a collector section (where multiple pipes all connect 2-1-2) boosts the midrange torque on certain setups. Dropping this yes you would have to take into effect the change in the exhaust volume.

Why would you want to add another can though ?
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Old 9 May 2011
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Originally Posted by gixxer.rob View Post
Why would you want to add another can though ?
I got the twin cans from another elefant (apparently, although the pipes don't quite fit, think it may have come off a Monster). The stock exhaust is very heavy indeed and sounds terrible, so the short answer is because these are the cans I have. I think they're too small to handle the volume from both cylinders. Also twin cans high up would look good (vain I know!)
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Old 9 May 2011
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New 2-1

Hey,

I've just put on my new MTC exhaust, it looks the mutts nuts and the sounds is pretty awesome to say the least, Needless to say, the neighbours know when I'm heading out on the bike, LOL!!

It saves lots of weight as I didn't realise quite how heavy the standard can is. The new one gives a bit more Ooomph, ho ho ho what fun!
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Last edited by geoffshing; 20 Jul 2014 at 13:35.
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Old 9 May 2011
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Nice! Any noticeable reduction in torque? MTC don't do anything off the shelf for my Pegaso, but they seem happy to take a look at it in their workshop. Will keep you informed as to how I get on.
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Old 10 May 2011
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Torque

Torque..... My God! I was trying it out today and the damn thing was trying to throw me off the bike! I did look suspicious when I could see straight throught the end can and that was with the baffles included!
To top it off, a 'friendly' bobby pulled me over (a constable friend of mine) and enquired to the exhaust sound. I showed him the BS mark and he was surprised but happy! His remark was "is it a B**LSH*T mark..?..." but no, it checks out and is good to go..! He's just pissed with me cos I ride a much meaner bike than he does, ha ha ha!
I also ride past the police college everyday.....! lol
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Old 6 Jun 2011
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Hello geoffshing. You have been running the single can on your Ten for a few weeks, what are your thoughts now.? Any downsides? I have just bought a Ten and am looking into the single can option. Anybody else have experience / opinions of the single can on their Ten? Cheers.
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