Just fitted mine on my Z4M today, and the noise, and performance is markedly better. The noise is heavenly good, and im now getting worried that when my Supersprint x pipes and race mufflers are fitted it will be too loud.
I fully recommend the GruppeM and although I have no stats to prove it the , the car seems much quicker.
I fully recommend the GruppeM and although I have no stats to prove it the , the car seems much quicker.