I agree with this, I have used both cork and rubber end pieces, the rubber ones are killer, the cork ones split under even light torque loads (18-20lbs) Although some guys use the cork and dont have issues, I say run the rubber.
[/QUOTE]To preempt the coming debate, I used the rubber end pieces, with a dab of RTV at each corner in my recent intake swap (first timer) with no leaks.[/QUOTE]
As far as the bolts go, ARP is great but you dont have to spend that much if you dont want to, if your bolts show any sign of corrosion change them. My intake first leaked water at 120K because of a failed bolt that was corroded. Make sure you put a bit of anti seize on the bolts before they go in.