i've asked questions in the past about noise coming from the DR or the pulleys or drivetrain but really havent come to a conclusion in fixing it. the noise is definitely louder than it should be. i visited bike stores only hearing that its normal. well before i changed my chain it wasnt as loud or loud at all until it started 'stretch" ...the new chain was put on according to the bicycletutor...wrapping chain around largest in back and largest in front (not going through derailleur pulleys) and adding 2 links for slack (1") ...my point is i thought it would be a problem if i found out my original chain was 2 links longer than the one i put on... i think this has to do with more tension on everything causing more noise to be on the pulleys. is this correct thinking or it has nothing to do with this?

thank you!