Is this a correct statement (english grammar) ?

Technically, yes. But it is very frowned upon in formal writing to use second person, so I would rewrite your sentence so that you don’t have the word “you”.
An example would be, “Although EP55 is avaliable on the makret, better results can be achieved with older hardware.”
Again, the problem with the above is that the second part is in passive voice. Play around with it for awhile-I’m not exactly certain how to fix it without the context.

Yes that’s grammatically correct, but make sure “although” is spelled correctly in the final version.

Yes except you need a definite article before EP55:

“Although the EP55 is available on the market, you can achieve better results with older hardware. “

I think this is what you want:

EP55 is currently available on the market, however you can achieve better results with older hardware.

“EP55 is available on the market, although you can achieve better results with older hardware.”

I hope I’m right.