125-200cc Performances of Hva racing exhausts on a WRE?

Hi there, does anyone of you know if a full exhaust and silencer system from Hva racing is worth anything to replace the original elements on my WRE? Those are done, so i first bought a DEP system on the web but the thing wouldn't fit (it was for 2007 to 2013 models and mine's a 2004) so i went back towards my dealer and he presents me this Hva racing system for 250 euros. Guys on french boards say it's a rip off, but they don't seem to understand that i can't put 350 or 400 euros in an FMF or BUD racing system.

What do you guys think about it? Waht do you know of Hva racing exhausts?

Thanks