Anyone else notice this

[79XS11F]

http://cgi.ebay.com/Yamaha-Exhaust-X...3A1%7C294%3A50

This is an e-bay ad for a NEW exhaust pipe that claims t to out perform all others. Part of the claim slams savaging as a method of improving exhaust performance but when you read the patents, the maker of the pipe claims in the intended design to provide savaging? Hmmmm
Anyone seen one of these or have any experience with them?
Rob

[randy]

No matter if the claims are real, looks like you'd have to drop the pipes to change the oil filter. JAT

[bikerphil]

I don't get it, How much does it cost?

[79XS11F]

I don't get it, How much does it cost?

It's like close to 600 US for black and an addition 225 for chrome. I didn't even look at it close enough to notice that oil filter access might be very limited. I was just surprised to see the maker of the pipe state that "old" savaging technology was no good, and then read the patent to see savaging as the design feature. you have to click the links in the e-bay ad to be taken from e-bay to the site where pricing etc is laid out.
Rob

[tarzan]

Oil changes would definitely be a pain.
It looks like it would also be in the way of the center stand and possibly the side stand too.
I wonder how it would sound?

[hamjam]

looks just like a 2 stroke expansion chamber
these have been used for years to get a pulse back up the exhaust to keep the fresh fuel mixture from scavenging out into the exhaust when both ports were open

[Cobia]

X-pipes

Hamjam is totally correct, the manufacturer of these pipes claims that the typical methods for exhaust "scavaging" are obsolete and they have a new technology that is a vast improvement over anything out there.
Right, wrong? I have no idea, but the often seen picture of an XS11 doing a wheelie is sporting a set of these pipes. (Sorry I couldn't find the pic)
Oh yeah, btw, at over $800 for a set of chrome pipes..... well, you know.

[79XS11F]

But wait .... the XS11 can do wheelies in stock form with stock pipes? 800 is a LOT of MONEY for any pipe...
Rob

[Ken Talbot]

Gotta say it sure does look good. It would probably be reassuring to know that it had a 12,000rpm powerband too - never know when that might come in handy!

[Thee_oddball]

nice pipes...now all he has to invent is a way to mount are oil filters on the side of the bike so we can change them with major surgery

[latexeses]

It would probably be reassuring to know that it had a 12,000rpm powerband too

never know when that might come in handy!

Just before you get a broom to sweep up the parts...

[Ivan]

The X pipe technology he is referring to on the Nascar circuit has nothing to do with scavenging. The pipes are made out of two 90º mandrel bends that are cut and welded in such a way as any direction through the pipes has a fully open straight shot through it. I remember the article from Hotrod magazine. It was very intuitive and overly simplistic. The article even gave the tutorial on how to cut and weld your own.

The system works by allowing the exhaust pulses to travel any way they need to prevent a pressure spike in the exhaust from two cylinders on teh same side of the engine firing in close succession. 1-8-4-3-6-5-7-2 <--- that 5-7 is the pressure spike. The X pipe allows this to propagate through either side of the exhaust and relieves the spike, much like the 180 headers used on drag cars, but cheaper, neater and easier to make.

Now since the 1-3-4-2 has two pressure spikes and they go through either side on the stock exhaust, if one really wanted to relieve this, he would make an exhaust that groups 1-4 and 3-2 together on the same side of the bike. Anyone care to guess which exhausts did this? That's right kids, the "Spaghetti" exhaust.

That X pipe would seemingly achieve the same result. Maybe even a little better flow than the spaghetti exhaust since it has the convergent joint in the middle. Dunno. I would want some guaranteed dyno results with the 8% power change before I spent $100 on the hype let alone $800. Even with the recent price gouge, a wiseco bore kit would be wiser money.

[andysutt]

So you guys with 4 into 1 dont have to drop your header to change the filter?

I dropped mine when I changed it, but it was to clean up the header anyways and it looked necessary

[egleaves]

I have 4-1 and I can pull my filter with very little trouble. I get a bit of spillage from having to tilt the housing a bit to get it around the pipes, but other than that it's pretty easy.

[81xsproject]

I have been eyeing the xpipe for years now. It is 579 for the black system. You could get it jet hot coated for like and additional 150.