Look at my posts re my 4.8 and make sure you know all there is to know about it
Spend the money on the PPI and be as thorough as you can

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06 4.8is Dinan S3
2007 Maserati Quattroporte GT Sport
2012 Porsche Panamera Turbo (sold)
2012 X5M (sold)
2008 RS4 (sold)
2001 996 Turbo (sold)
2009-2010 Cayennes (2x GTS, 1 Turbo) (sold)
2006 Silver/Black 4.8is (black ice victim)
2003 4.6is Swartz/Black (sold)
LN80844
03/06
(Little Swine)