Hi all, the tuning company väth you know surely all. which offer for the slk200 (without compressor) a tuningkit: “+21 hp through exhaust system and fan manifold” I am quite skeptical… one thing is clear, exhaust system does not bring an increase in performance, and that the fan manifold 20hp and 30NM should bring I can’t believe! cost would be ~1300€ Performance data: 157hp, 220NM/4600 someone already has experience with it, or can take on it?