Hello all, my 136 HP C4 is subject to firearms but… nevertheless I found it sad that today the E-Class 300 CDI slowly pulled me away with a squeezing exhaust (the filterless ts ts) mountain. Does anyone have experience with an increase in performance? Wetterauer with 163 HP and 420 NM is virtually on my doorstep. Is there better (stronger?) What to consider? Warranty, durability, insurance… I am looking forward to the answers…