Marelli egr valve

Hello friends, I bought a 2010 partner 90 vehicle 1 week ago. engine malfunction lamp was on. In the researches, we changed the problematic, egr. the master installed a marelli brand egr valve. I said my original piece said it was original but today I researched it was not the original one, while it was 350 TL, the original was 570 TL. My main question is that I do not quite understand that I just bought the car. When I turn on the air conditioner, the car drops from the traction. I wanted to know if there is such a low traction in the original ones. or am I having trouble using this brand?

There will be some decrease but not exaggeration, of course