I think itd be worth looking at. Read up on here how to identify parts (markings etc.) and just look over the bike REAL good. Have the ad on your phone if you find something it doesn't have knock off some on the price.
Are you asking for recommendations? I ride trails and have Paul Turner Mids seem like a really good trail pipe to me. Not a killer topend but decent power low to mid and i don't have any porting.
Just pressurizes the motor with air. Has a gauge that if it goes down significantly you can spray soapy water on common leak areas until you find the leak. This will tell you if your crank seal is leaking.
Im talking about this idiot. http://southcoast.craigslist.org/mcy/3693181296.html
He posted that damn thing 5 times that post is from march 27th maybe he just gave up. I hope.