What kind of kit was it? Unless it was Ishino, Stone, or OEM its gonna have a shitty egr cooler and exhaust manifold gasket.
http://www.supramania.com/forums/showthread.php?108850-Gasket-kits....let-the-truth-be-told/page3&
http://www.supramania.com/forums/showthread.php?108850-Gasket-kits....let-the-truth-be-told/page3&