I put a little vaseline on the manifold to Y pipe hose, slip in on and then carefully twist it down into position. No skin lost. 20nm is what I remember for the torque or 15 ft lbs. Use new metal gaskets please, a little copper spray will insure no leaks but isn't imperative. I have lock washers on the bolts and use locktite blue. Probably overkill but I prefer to be sure. Put good gas in your tank. The manifolds lean out the mixture a fair amount. A retune should be part of your plan. Above all take your time and have fun doing the work. Les's key to success.

Les