Anyone else notice this

[tbishop11]

here they are again Xpipes

[81xsproject]

Oh yeah, and the bike doing the wheelie in the photo is NOT an XS. Judging by the small size of the timing and stator covers and the round master cylinder reservoir, I think it is a KZ or a GS.

[DGXSER]

That and the round MC does not look XSively Yamadog to me.

[Pat Kelly]

I know the original designer of the "Maxi X Pipe. His name is Pat Egan. He won the 400cc Box stock and Street production nationals in 1978.
I Email the company a few years ago asking if that was Pat. The reply was very defensive and they wanted to know how I knew Pat.

The pipes sounded nice. I only heard them on Kaw 750's. An interesting phenominon was, with the bike idleing, put a small piece of paper by one exhaust outlet. It will be sucked in that side and spit out the other muffler.

So, this "new" technology is at least 30 years old. I'm guessing Pat sold the patent or rights to someone. He was out of work and low on $ last I saw him (early 1980's).

[79XS11F]

I did some research a few years go on exhaust engineering and found a few articles on the subject. As I understand it, savaging effect in 4 - 1 type pipes is controlled by the design, DIA and length of the collector pipe. How it's designed will determine where the power is found. Keeping the exhaust gases HOT is also an important input factor and the reason some folks use exhaust pipe wrap on the header pipes. Gases expanding through the collector draw out the gases in the cylinders that are firing next in the order. So this pipe has a different size and shaped collector which is suppose to do a better job of savaging those gases. That's really the only difference i see as compared to other types of pipes. I also would want to see real proof before putting out that kind of money on a pipe. As was pointed out that kind of money can buy bigger displacement that will deliver added HP cross the board no questions asked.
Rob

[79XS11F]

Oh yeah, and the bike doing the wheelie in the photo is NOT an XS. Judging by the small size of the timing and stator covers and the round master cylinder reservoir, I think it is a KZ or a GS.

Agreed, the bike in the photo is chain driven so it's not an 11 for sure. you can see the chain in the photo.
Rob