I am concerned about headers to be honest, some people say install is brutal, other say it is ok. If I go with SD headers, I need 4 clamps? 2 - 3" and 2 - 2.25"? Will the install be significantly easier with the SC & LIM out of the way? What about leaks (something that will bug me to no end if I can hear it)

When you say DHP PCM, you mean one of the v1.0's for $125?