The Vitos is kit is the poor mans big bore. There are better quality/performance kits avalible. Send your buddy over to www.BlasterHQ.com . Even though theres a large amount of kids on there, theres a few older guys who really know thier stuff.
You cannot use a 3 jaw puller or any other puller besides the ones Otis and boonman described. I bought one on ebay and the peice of shit stripped out on me first time using it... bought the MotionPro next and it's worked flawlessly
Yeah, the DMC 916's are not a 2:1 pipe. Do a little searching around on here, I believe someone bought one new off a website a few months back and posted the adress.