I HAVE A 97 540I 6 SPEED N WEN I SHIFT ABOVE 6000 RPM AT SECOND THEIR IS A HARD KNOCKING NOISE UNDER MY CONSOL UNDER MY FACTORY PHONE AND I NEED YOUR HELP GUYS TO GIVE ME AN IDEA WHAT POSSIBILITYS THEY ARE THANK YOU. YOURS TRULY, KIRK P.S COULD IT BE THE DRIVE SHAFT,TRANSMISSION OR CATALIC CONVERTERS????