Will this muffler http://www.horizonhobby.com/Products...ProdID=RVO1150 work on this engine http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHGN9
and will these fit together fit in a kinetic 50?

yes that will work, but it is a bit restrictive to get the most from the hyper.

Here is a better one that was designed for use with the OS50 Hyper and the new YS50.

http://www.heli-world.com/detail.aspx?ID=9003

And this one is even better:

[link]http://www.heliproz.com/prodinfo.asp?number=128699[/link]

panzertank: To tell you the truth, I was expecting an off the wall engine on the link you provided. That is a well recognized OS Hyper. No introduction required.

Rafael

so im guessing that that is a good website to buy off of?

One of the best

Are asking about Heliproz? [X(] You must be joking! They are the best in the business. I don't stock spare parts anymore thanks to them. I can smash my helicopter inverted at full throttle during the weekend, go to their webstore on monday, and have the repair parts at my door on thursday. repair the heli thrusday and friday to be ready to fly during the weekend again.

I visit two stores regularly:
[link]http://www.heliproz.com/[/link]
And
[link]http://ronlund.com/[/link]

See a trend here?
You will not get a better customer service anywhere else.

Rafael

Just to clarify i was talking about http://www.heli-world.com/default.aspx. Your statment still holds true, i'm sure, right?

No we were speaking of Heliproz

I have purchased form all three many times in the past 10 years or so, and find all three good shops to deal with.

As for muffler, I have also tried both the CY and the century unit on OS50 Hyper AND YS50 and found them much the same.