new exhaust manifold, intake lumbing, larger MAF, intercooler, full custom Tune, larger injectors, exhaust downpipe from turbo to CAT, blow off valve, oil feed and return lines, bypass valve, guages to monitor oil pressure, boost and Air fuel ratio... and $300-$400 in extras that you find need to be replaced or you brake or forget about like gaskets, and clamps.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)