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Message: <blockquote data-quote="gotrnet" data-source="post: 2218136" data-attributes="member: 547708"><p>it is the same head.  the gst, gsx, tsi all have the same 4g63 engine with the same head.  the only thing that makes the gsx better is the awd, not the head.  the car will hold the same boost pressure either way.  i wouldn't waste my time or money.  if you want to hold more pressure build the bottom end and get a big turbo on it.  the stock head can hold 30+ psi of boost.</p></blockquote><p></p>