2-1 or 2-2

Joseph · Full Member Joined: May 22, 2007 Posts: 767 Location: NY

General question comments would be appreciated. does 2 to 1 exhaust increse flow? seems like it would restrict it.

drifter · Posted: May 8, 2008, 4:15 pm Post subject: Re: 2-1 or 2-2

I only know regarding Harleys, but it them, a 2 into 1 increases flow but only very slightly. Not enough to need rejetting or anything. How that relates to an XS650, I couldn't say.

xs1961 · Posted: May 8, 2008, 4:51 pm Post subject: Re: 2-1 or 2-2

Bottom-end up to just below mid-range performance should be ok or slightly improved with 2-1 but will be strangle performance above that!
Stick to 2-2 if you can ..You need to get those gasses out as quickly & efficiently as possible !

jayel · Posted: May 8, 2008, 4:56 pm Post subject: Re: 2-1 or 2-2

plus I heard a lot of comments about mac 2-1 dragging in left handers and fitment problems around the head to pipe junction (not enough flange area on the pipe)

ponyjr · Full Member Joined: Jul 30, 2007 Posts: 32

you would really need to be leaning to drag with a mac. ive got one and have yet to come close

Cooltouch · Posted: May 8, 2008, 8:05 pm Post subject: Re: 2-1 or 2-2

Welp, the bike might have a problem with dragging in right-handers, not left. I have a set of Mac 2-1s on my '81 and, like ponyjr, I've never dragged mine. I'll drag my right shoe every now and again, and I figure that's far enough over as I need to go.

When I bought my bike, the Mac system had already been installed. I've always had a problem with the muffler not fitting tight on the headers. It won't slip on far enough. I have an '80 garage queen with the same set, but its muffler is nice and tight. So, I guess there might be some variability from one set to another.

Best,

ichael

jayel · Posted: May 8, 2008, 8:28 pm Post subject: Re: 2-1 or 2-2

did I put it on the wrong side? ah well

What Happened to 650rider.com?

Yamaha xs650