Two into One

wally · Posted: March 8, 2008, 1:44 am Post subject: Two into One

Whats the benefit of a free flowing two into one system
over standard exhaust system

Cooltouch · Posted: March 8, 2008, 1:51 am Post subject: Re: Two into One

Supposedly better scavenging? Tell you what, though, when I bought my XS, it had a set of Mac 2-into-1s on it. Been too cheap to replace them with something else. I find the Mac's exhaust note annoying. A good set of 2-into-2s sounds much better.

Best,

Michael

dwyatt · Posted: March 8, 2008, 2:45 am Post subject: Re: Two into One

Michael,

Any interest in selling yor MAC 2-1 to help fund a new exhaust?

dwyatt · Posted: March 8, 2008, 2:46 am Post subject: Re: Two into One

Michael,

Any interest in selling yor MAC 2-1 to help fund a new exhaust?

dwyatt · Posted: March 8, 2008, 2:47 am Post subject: Re: Two into One

Michael,

Any interest in selling yor MAC 2-1 to help fund a new exhaust?

Cooltouch · Posted: March 8, 2008, 2:21 pm Post subject: Re: Two into One

Yeah, there's some interest, but I dunno if you'd want it or not.

The header pipes are pretty blue, and the muffler has never really fit right. Dunno why not. Come to think of it, I have a set on another bike I could probably take off. The muffler fits better on it. Haven't looked at it lately though. Condition is probably roughly the same.

Best,

Michael

grizld1 · Posted: March 8, 2008, 6:30 pm Post subject: Re: Two into One

Wally, one of the advantages of 2-1 systems is that you won't be tempted to corner as hard in right-handers; the left-cylinder header will ground between the lower bend and the collector. Haven't seen one yet with decent clearance.

Cooltouch · Posted: March 8, 2008, 9:18 pm Post subject: Re: Two into One

Hey grizld1,

On the above bike, I've never ground the left hand pipe when leaning into a right hander. Usually the foot peg rubs before this happens.

Best,

Michael

Jack · Full Member Joined: Mar 15, 2005 Posts: 411

Cooltouch....bring your XS down to the Smokey Mountains of WNC,I'll show you how easily it is to peal back the metal of the left header,might even be able to score on the right if I lean it over hard enough Laughing

:lol:...........Jack

Cooltouch · Posted: March 9, 2008, 12:30 am Post subject: Re: Two into One

Jack,

If I'm rubbing a peg, I'm leaning far enough over for my tastes.

dwyatt · Posted: March 9, 2008, 3:19 am Post subject: Re: Two into One

Michael,

I don't need the muffler, just the header and will paint it black anyway, so those problems are no issue for me. I'm building a RR track bike and want to run this type header with a shell megaphone. I'll probably do some cut/weld or bending to tuck in better for ground clearance. I'm also changing the rear shock mounts to raise the rear for handing, but it also improves ground clearance. Let me know what you think, I live in the Woodlands.

wally · Posted: March 9, 2008, 3:41 am Post subject: Re: Two into One

Supposedly better scavenging? Tell you what, though, when I bought my XS, it had a set of Mac 2-into-1s on it. Been too cheap to replace them with something else. I find the Mac's exhaust note annoying. A good set of 2-into-2s sounds much better.

Best,

Michael

Thanks Michael

I went on a run today with two into one pipes
Seem to have more torque?
Wants to get up & go
also more engine vibration than I had with the original pipes?

Jack · Full Member Joined: Mar 15, 2005 Posts: 411

Cooltouch............it's not the leaning over that gets the pipes,it's the degree of the radius turn and road service camber,entry speed,riding style and ground clearance provided under suspension loading................Jack

xsthomas · Posted: March 23, 2008, 9:39 pm Post subject: Re: Two into One

Im looking for a 2 / 1 myself, black header and use my muffler. getting hard to find. I hear there is only 1 company left that makes these and there out of production now, when they will be available who nows. I see a few on ebay, not sure I want to risk that, the fit on some of these can be bad, I have a 75 XS 650, most I see are for other years. Phil

pumps · Posted: April 2, 2008, 6:36 pm Post subject: Re: Two into One

Something I saw on ebay that it says is a "factory 2-1 off an XS650". pehaps someone can elighten me to the facts on such a thing ? If there is/was?

cgi.ebay.com/ebaymotor...dZViewItem

5twins · Full Member Joined: Aug 05, 2006 Posts: 1616

There was never a factory 2-1 to my knowledge. If it was factory, I'm sure the header flanges would be finned. I also don't think it would have that sliding track mount on the muffler part, a definite sign of aftermarket.

xs1961 · Posted: April 3, 2008, 3:58 am Post subject: Re: Two into One

No such thing as a 'factory 2-1' ....

grizld1 · Posted: April 3, 2008, 6:51 pm Post subject: Re: Two into One

If you don't like the exhaust tone of the mechanical baffle, MAC makes a "competition" baffle which is a straight-through glasspack design. I use them in my 2-2 system; nice sound, very mellow, not too loud. My only gripe is that they use a louvered core rather than smooth.

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