intake install
1. ls6 coolant lines- is it necessary I drain the coolant before i swap the coolant lines? i just changed the coolant last month and dont want to deal with that crap again. i do expect some coolant would leak out, but not a lot. correct me if im wrong
2. back of the the intake i got a map sensor, a big vacuum line that goes to the brake booster, and then a small vacuum line. where does that vacuum line go to (pcv system?)?



