There definitely should be no sound that is louder than the stock exhaust. Anything that sounds different than a well oiled sewing machine is not a good sign.
Describe the noise some more. If it has any grinding or rattle to it (muffled), it may mean that your new tensioner(s) are no good. Try to pinpoint the noise by using a long screw driver or breaker bar as a stehtoscope and put it on the chain covers. (Careful with a running engine there!)
The carrera tensioners are silent, just like the ones you took out.
Did you mess with the chain ramps? Maybe something is just slightly rubbing.
George