Header install tips and tricks?

Glad to hear you got your headers on and they will sound sweet. Am rebuilding a 70 Duster and really read alot on the forums to help me decide what kind of headers to put on my car. Decided to put on Hedman Shorty Headers and can take them off and put them on again if needed without moving anything. I might give up a little performance but the movability is worth it. Just something to consider.