I am looking for new exhaust, need some opinions from you guys. http://www.kreissieg.com/ or Hamann Kreissieg is a japanese company and you can control the muffler sound by a remote. Level 1. It is equal to normality. Level 2. Quiet sports muffler. Level 3. Sports muffler of loud sound a little. Level 4. Sports muffler of Hi pitch loud sound. Level 5. The Super Hi pitch sound. Hamann has everything from the header to rear muffler, but no adjustable valve controller. Ofcourse the best combination would be Hamann header+Kressieg rear muffler, but do they fit each other?