GM Ultra Engine
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The C25XE is a Family II, General Motors engine. It is a 2498 cc (2.5L), DOHC 24 valve, 'V' configuration, 6 cylinder engine producing 170bhp. It is commonly found in the larger of the GM range of cars - including the Opel/Vauxhall Vectra, Calibra, Cavalier and Omega. 
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A special edition of the engine was worked by MSD (Motor Sports Developments based in Milton Keynes in England, UK), which includes reprofiled camshafts, giving the engine a boost of 24bhp. This engine appeared in the special edition MSD Vectra GSi's. 
- "Calibra Wiki V6 information". Calibra Wiki. http://www.calibrawiki.com/index.php?title=C25XE. Retrieved on 2008-04-13.
- "EVO Magazine Vectra GSi review". EVO Magazine. http://www.evo.co.uk/carreviews/evolongtermtests/19911/vauxhall_vectra_gsi_v6.html. Retrieved on 2008-04-13.