without rebuilding, as in valve seals, headgasket, headstuds, bearings, and a gasket set PLUS A GOOD TUNE, YES, YOU DO NEED TO ACTUALLY TUNE IT, then it will be reliable.

ebay stuff is good for intercoolers, exhaust manifolds, and exhausts. and get the s13 sr intercooler setup if youre giong to run a bottom mount ka-t setup