I received 1 exchange inlet manifold from PMG Technik in Poland. The engineering looks good and it's nice & clean inside, not full of thick tar like mine. The butterflies are machined aluminium to replace the VAG plastic parts. Nicely anodised in red, shame they won't be seen! BUT they are thicker at the spindle. The plastic ones are 5.5 at the thickest part, these are 6mm. I have no idea how much 1/2mm will affect air flow & output. probably not much. Anyone?