buying a tt posted by JRFITZ on March 07, 2013 at 09:58 AM
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compression test it if possible.. look at the coolant,boost,pcv hoses for cracks and/or damage. check fuel lines closely! try to see if the injectors have corrosion on them, look inside the turbo housing to see if the "good" turbo has any shaft play, if the turbo was rubbing against the housing. theres more but thats off the top of my head. best of luck with your purchase and make a build thread for us :D