are there any aftermarket valves for 04 TE 450

Does anyone have an aftermarket supplier for inlet and exhaust valves for an '04 TE450?
They are asking over $1100 AUD for a set here.
Surely someone does them non genuine?

Resume normal programming

Okay Hall's have them.
Has anyone here used these valves?
I cant image there would be a significant performance loss due to the extra weight.
It would only be few ounces

update.

i would think you would want the updated valves, with larger dia. stems, which will require new quidess. I would think paul feeney ?? would be able to do an update on it. neew valves are from del west. ti valves.

what about the rings?

How about longevity Motosportz?
Did you do many kilometres or miles with them fitted?

Another question the local Husky dealer parts guy tells me that to buy a ring set I have to order each ring separately, the parts book I have certainly shows two part numbers doesnt give any explanation why.
Whats the real deal?

i switched out my 2 titanium exhaust valves for stainless valves about a month ago. new springs and valves and seals was under $200..no noticeable performance loss.