they are a bit soft in the rear,same as an aircooled,rock hard front,and soft rear,sleepy policemen catch them out.............,i hope you were carefull fitting the exhaust,they are prone to stress failure if fitted under any form of stress,the bottom brackets sometimes need carefull shimming so as not to stress the cylinder head end......again,the aircooled can suffer with this as well.
hope all goes well for you