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the casting of the B20 Head is IDENTICAL to the b18 head.
so no gains from that... the b20 cams are different though so you may gain from that.
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2012 VW Golf 3 Door Automatic (Company Car) 
2011 VW Golf Wagon 5 speed (Company Car)
2010 VW Jetta 2.5 Automatic (Company Car)
2009 VW City Jetta 5 Speed (Company Car)
2009 VW GLI 6 Speed (Company Car)
2008 VW Jetta 2.0T 6speed (Company Car)
1999.5 Audi A4 Quattro Sport 1.8t (Chipped 1.0 bar) Sold
1990 CRX Si (Built B17a) - Stripped and Crushed
1988 CRX Si -- Stolen
1990 Civic Cx -- Sold
1990 Civic Si -- Parted
1989 Civic dx -- Sold
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