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Old 04-13-2015, 05:47 AM   #1
slashfive OP
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GS collector box consensus?

whats the word these days?

have read varying opinions on y pipe vs stock box.

mine has deteriorated and need a plan.

anyone with a good box or Y to try please PM

thanks.
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Old 04-13-2015, 09:53 AM   #2
Mark Manley
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I fitted a Keihan Y piece to mine and never noticed any difference to performance, others will say it loses mid range power compared to the standard collector box.

By the way the word consensus does not exist here.
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Old 04-13-2015, 10:26 AM   #3
Airhead Wrangler
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I had a y-pipe and straight through reverse cone on my ST for a while before switching over to the later stock mono 2-2 system with quite a chunky collector box. All I know is that it would easily throttle wheely in 1st and 2nd gear with the y-pipe and will not throttle wheely at all with the 2-2. Take that for what it's worth. I went with the y-pipe and reverse cone for weight savings, but the noise was a bit much to take so I swapped in the 2-2 I had on the shelf.
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Old 04-13-2015, 10:34 AM   #4
airhead_irl
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There's two designs of y-pipe. I believe the variant with the equal pipe length in the one to go for. The earlier type did not get great feedback. I think Rob Farmer on here compared stock vs earlier y-pipe on the dyno - stock won.
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Old 04-13-2015, 10:47 AM   #5
Airhead Wrangler
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Quote:
Originally Posted by airhead_irl View Post
There's two designs of y-pipe.
3 if you count mine. Fubar made mine for me. It has a nice smooth merge collector on it. The old kind that merges together at 90 degrees is just idiotic.

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Old 04-13-2015, 11:03 AM   #6
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thanks all

anybody have one on the shelf before i decide on a new one? will post in airhead FM as well
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Old 04-13-2015, 12:33 PM   #7
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Quote:
Originally Posted by Airhead Wrangler View Post
3 if you count mine. Fubar made mine for me. It has a nice smooth merge collector on it. The old kind that merges together at 90 degrees is just idiotic.
Yo! Nice...
'fubar have a pattern for that? Mewant.
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Old 04-13-2015, 12:48 PM   #8
Airhead Wrangler
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Quote:
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Yo! Nice...
'fubar have a pattern for that? Mewant.
I sketched it up and ordered all the bends for it. FUBAR chopped it all up and welded it back together again. He could use mine for a pattern if you want one. It fits stock r100gs headers and exits at a lower angle and location than would be compatible with the stock muffler.
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Old 04-13-2015, 01:18 PM   #9
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Quote:
Originally Posted by Rapid Dog View Post
Yo! Nice...
'fubar have a pattern for that? Mewant.
He was planning on producing them for sale. I'm not sure what happened.....he's probably too busy.
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Old 04-13-2015, 01:43 PM   #10
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thanks for info, im in for one if they go into production and compatible with stock muffler.
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Old 04-13-2015, 04:22 PM   #11
bgoodsoil
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I bet some of the y-pipe poor performance rumors are because Keihin's is such an obvious piece of junk. I'm no expert but I'm pretty sure a 90 degree merge is bad for maintaining a laminar flow



1.5" OD pipe fill fit the BMW head like it was made for it. This crossover cost me a whopping $30.





For the price of a crossover, you could buy a welder AND a crossover. I'm not a welder and it's not some Dark Arte outside of the realm of Miere Mortalles.

Not as pretty as A-Dubs, I'll grant you, but it's not like you can see the thing.
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Old 04-13-2015, 04:38 PM   #12
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I had an interesting ride with another GS rider. On slow technical terrain my bike could ride slower with better pick up than his.

His has a Y pipe. Mine has an old Staintune low profile collector box and muffler. Was thinking of updating it but am happy to repair it and keep it.
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Old 04-13-2015, 04:42 PM   #13
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The presence of an early crossover will throw a curveball in the collector box discussion.
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Old 04-13-2015, 04:58 PM   #14
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I haven't noticed any lack of go with this:


(Yay, another variant!)

I have noticed a significant lack of any maintenance whatsoever needed in that area for the past 30k miles. As opposed to having to patch up and/or replace the collector regularly before that. (I declared my second collector unsalvageable at 90k miles because it had extensive rust holes in 3 places.)

It's somehow odd that with allll the stuff that's available for airhead GSen, nobody seems to make a stainless collector box.
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Old 04-13-2015, 05:12 PM   #15
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